Its not auto attack based champions that love it.

Its champions that weave in empowered AAs that love it.

Jax gets insane value by being able to do proc TF so many times in a fight because of his Ws low cooldown.

Same goes for all of the main champions that buy it. Corki, Ezreal, Camille, Gnar, Gangplank, Zaahen, Nasus, Yorick, Fiora, Wukong

All of those are champions who build it in a majority of their games. Youre just not paying enough attention

It's just a generally fine item. It doesn't do anything specifically good. Adcs do more with crit, others benefit more from tiamat items, champs like Irelia much prefer BotRK. It does a lot, just not enough to be preferred in a lot of cases.

Because it's an item that gives a lot of stats + Sheen effect, ideal Triforce users need the following to maximize its value:

1. Spammable low CD ability to proc Spellblade often

2. Make use of Health + AD + AS + CDR (mostly bruisers)

A lot of champs can use it, but factoring in its cost and Sheen's painful combine cost, it's only the ideal rush on specific champs nowadays.

Volibear's cooldowns are quite long early, and Yasuo and Yone generally rush BoRK because their CDR value is low (their primary ability Q CD scales off of AS), and they only have room for 1 luxury non-Crit item before their buildpath gets expensive.

FYI Smolder's meta build has been ER rush since his crit changes a long time ago.

It's pretty expensive stat stick item, and there are a lot of cheaper items out there that synergize more with specific champions. SOmeone like Illaoi might love triforce, but why bother when IBG is there at 2900 or cleaver at 3000? Theres a world where ambessa might like triforce, but eclipse is also great at only 2900 gold. This compounds because competition for second item is also really tight, and its still really expensive. Its decent to good on a lot of champions, but its rarely the best so its just crowded out by its own cost

TriForce is a great item, but it's also one of the most expensive items in the game. Whether a champ builds it often comes down to how well it uses Sheen. Champs like Yone and Yasuo have low base AD so they don't use it well. Irelia uses abilities way too fast to proc the 1.5 second cooldown sheen. Volibear can build it, and it's been solid on him in the past. But he can build everything and other items are just better. Same with Olaf, he just needs stride or ravenous more. It's not bad if you want to just split push and don't need the extra slow from stridebreaker in skirmishes, but why would you pick Olaf to split when Fiora, Jax, Trundle exist?

It's because Jax for example applies on hit effects like sheen on W. Yasuo does too but he uses a lot of Qs in a row where sheen has too long of a cd to be worth it.

A lot of Champs do build it. Champions that love spellblade effects usually love trinity force; it can just be tough to justify as a first item because it costs 18 billion gold.

One other aspect is that sundered sky replaced triforce for some bruisers preferring the heal over flat hp

For example Voli would build it great, no? Yasuo and Yone? they'd be a little more tanky aswell with the item Olaf would go crazy, free 250 damage after every E or Q

Yasuo (and I think Yone but forgot) used to build it, Riot doesn't like when they are too tanky so they buffed their crit scalings, they are kind of forced to build crit right now.

Olaf seems like the most obvious Stridebreaker user of all time. He loves the slow. And then after first item he just builds utility/defensive items like Death's Dance, Sundered, Hexplate, etc.. The extra DPS from Trinity isn't worth it for him.

Volibear CAN build Trinity Force and has in the past but right now he has better builds. For example full tank and just relying on base damages is pretty good because with his base damages it's not like teams can ignore him so he serves as a very strong frontliner. Or the AP build of RoA -> Flickerblades. Volibear gets attack speed from AP and his passive has an AP ratio meaning AP is the best for a bruiser/DPS build (which Trinity would usually fill). There's also Cosmic which is less tanky but it gives him much needed movement speed. One of the only champs in the game that rushes Cosmic because of how good MS is on him.

Trinity is good for singletarget damage and many champions have aoe damage.

I could be off, but the stats feel like they don't justify the high cost unless you're really good at using the Sheen proc.

Sheen

So "few" is the word you're looking for btw.

It’s boring.

Trinity Force is all about the spellblade effect, which is pretty much only worthwhile on champions with abilities that are enhanced auto-attacks.

Champs that can run Trinity Force well:
* Camille (because of Q)
* Darius (because of W)
* Ezreal (because Q applies on-hit effects)
* Fiora (because of E)
* Gangplank (because Q applies the effect)
* Garen (because of Q)
* Gnar (doesn't really have an ability that synergizes with it, he just really likes the combination of stats)
* Hecarim (because of Q's low cooldown)
* Illaoi (because of W)
* Irelia (because Q applies the effect)
* Jax (because of W)
* Nasus (because of Q)
* Sett (because of Q)
* Shyvana (because of Q)
* Smolder (because of Q)
* Trundle (because of Q)
* Udyr (can easily trigger it with all his abilities)
* Vi (because of E)
* Viego (because Q applies on-hit effects)
* Wukong (because of Q)
* Xin Zhao (because of Q)
* Yorick (because of Q)
* Zaahen (because of Q)

It’s a jack of all trades master of none item. Your champion needs to have very low base cooldowns to constantly proc it and get value out of it. Even the best users of it incur wasted stats that they don’t really care about despite the gold value.

What if I hold my spells back and try to weave them in to get more Spellblade procs? You’ve just delayed your second rotation of spells which can be fatal. Alternatively, the enemy might disengage after dumping 3 spells onto you while you only got in 1 spell.

Additionally triforce’s spellblade scales with base AD. There are a handful of champions who either gain tons of bonus AD, have high scalings or have strong on hit effects and in turn get balanced to have low base AD to not be level 1 power houses. Champions like Senna or MF in particular (along with most ADCs) have low base AD and can’t build Triforce.

Triforce is balanced around Ezreal. This machine gun gremlin that is firing out a Q every 2 seconds.

Right now, Sundered sky is in way too strong of a state. Vi used to build triforce several seasons ago and now Sundered Sky, Black Cleaver, even her cheese lethality crit build is performing far better than Triforce, an ancient item that hasn’t been changed despite power creep everywhere.

Sundered Sky is what allows Riven to pop her ult, get a ton of bonus AD, waste all her dashes, flash auto your ADC with a 900 crit into R execute and heal back 50% of her HP from triumph, death’s dance and sundered Sky auto.

Yasuo and Yone prefer lifesteal, on hit and above all crit. A single crit item causes every one of their autos to hit harder than a spellblade auto. Some of the power budget is in haste, neither of the use haste leading to wasted stats.

Triforce doesn’t suit Olaf’s trading pattern which is long distance poke or continuous all in autos. If Olaf picks a bad all in or tries to take very short trades, he gets chased down and kited.

Triforce Vayne and Smolder are examples of cheeky ranged tops making full use of its hit and run capabilities.

Triforce Darius is due to how his passive interacts with Quicken. For most champions, 20 movespeed for 2 seconds is meaningless. Darius likes to apply his bleed to a minion and suddenly he gets 20 movespeed for 8 seconds which makes him deceptively closer to you than expected. He still goes Stridebreaker anyways, Triforce isn’t stated well.

Champs with auto attack resets really like tri as well. Gives insane burst with an easy trade pattern early in lanes.

To me the item seems lowkey bonkers, gives all the right stats, and free damage after almost every ability.

It's not. Other items are often simply better for either utility (stride, rav hydra) or raw damage (botrk, yun tal)

From a game design perspective, tri-force can only ever be slightly underpowered on champs like Olaf, Voli, Yone because because Jax and Camille exist. These champs can force an in-and-out playstyle, always trading around spellblade passive. Changing numbers is not going to fix it. They need to fundamentally change the item or the kit of in-and-out bruisers for it to be widely viable on more linear champions.

Then you can ask the question if that's even worth it, or that the niche the item fills right now is good enough. I'd argue it's fine the way it is. I haven't played the new patch yet, but last season olaf had two viable builds, voli had three, yone had two, yasuo maybe 1.5.

Used to be first item for a bunch of champions because there weren't as many niche items that fit specific playtimes (ie stridebreaker, eclipse, etc)

Voli does build it. Or at least should build it most of the time. Gnar builds it, trundle builds it, Wukong… there are a few