Can we finally admit that armor penetration itemization introduced recently is broken in it's core?
Armor penetration is actually pretty weak this season.
In seasons 3~5, you could achieve 55%+30 armor penetration with a
combo, which was the core build for a wide range of AD casters.
Now...45% vs. bonus armor is much worse than 35% total armor, and Black Cleaver requires 6 stacks to reach 30% rather than 4, offering 30% penetration only on the 7th physical damage application rather than the 5th.
You have to build all the armor penetration items in the game for less armor penetration power than was previously avalible, which shoehorns a lot of AD champions into only building armor pen items so they can actually deal with all the tanky assassins, tanky mages, tanky supports, tanky marksman, fighters, and tanks in the game.
is already on likely-to-be-nerfed in 6.16 list as confirmed by Rioters. Who will be next?
That's more of a Jhin problem than an itemization problem.
Especially considering Jhin values AD and armor penetration more than any other stats. Regardless of the state of AD and armor pen, he's always going to build those.
His crit/AS conversion exist to make him not feel terrible about a wide range of items, they don't make crit and AS as cost efficient as raw AD in regards to boosting his damage or as useful as armor pen at multiplying his damage.