Honestly that's not a whole lot more from previous patches. Yi's strength has always been pretty much insane melting and DPS, probably even literally the best in the game.
The reason you pick Yi is to melt everything basically. Your R kinda has a shit QOL since the highlander nerfs, your W is fine I guess but easily interruptible, your base defensive stats are terrible, your earlygame ganking is trash. If you're laning him you have kind of a huge powerhole between around lvl 4 to "2 items spike".
He's in a weird spot. He's a pretty insane lategame carry, but he's melee so he can get fucked hardcore by CC unlike most ranged carries. He gets substantially stronger if paired with some shit like Lulu, Morgana (black shield), Kayle but at the same time you rarely get the picks you want on your team. And jungle/supp duo is meh. Toplane supp is meh.
Anyway the nature of the pick is this hard winning or losing scenarios where you pretty much either pentakill or just die without doing anything. But that's in the essence of his kit, with the very limited highlander where you absolutely have to kill someone fast, get reset and rageblade stacked and then melt anything, or get CCed/kited/bursted or highlander expires and you're suddenly an old man in a wheelchair.
Is it problematic? I don't think so. Yi's identity is pretty much all in duellist. He's got his hardcounters, his play patterns can be abused but when they aren't he pops off like absolute crazy.
Imho, that's healthy. Like he gets to be insanely huge if he doesn't get denied, but at the same time he has to either play well (dodge a bunch of crap and meditate bursts, position and engage at the right time) or his opponents to play bad (splitpush randomly, overextend, burn every CC on something not necessary) to get to that state. As opposed to metapicks that are pretty much good in every scenario and have no real weakness, I think that's better. At least it doesn't feel like you can't do anything against him (unless you have 0 CC and mobility I guess) and it doesn't feel like if he gets ahead he's better than you in literally all domains like a polyvalent meta pick would. He's still susceptible to CC, burst and doesnt bring any utility whatsoever.