Regarding Yi and how ludicrous he is right now
I made a post before that got some notice, but Yi does 1000 true damage in a single 1v1 in about 2-4 seconds with Guinsoos+Conqueror+E. With Bloodrazor, this significantly increases and with Essence Reaver it's one of the most unhealthiest combinations in the game.
However, Guinsoos isn't why he's broken. Most guinsoo based champions have sub 50% winrates with Kai'Sa being the exception. We also can't nerf Yi's kit because before Conqueror, he was really weak. It says a lot.
It's more of an issue with Conqueror. Introduction of more true damage in the game was the worst thing you could do. It is a simple task just to add more AD as a fight progresses, but 20% of damage to true damage is way too much since many champions can execute you or chunk you now.
We get bruisers/juggernauts were in a shit state because of ADC damage but you should've listened to the Boards and nerfed ADC damage first. Rather than have Conqueror proc on minions, it should be on champions as it's for extended trades. You making Conqueror able to interact on minions means you know damage is so high across the board champions can't last that long to be significant threats. They just target the squishies and then move all their power on the frontline.
I say change Conqueror to either be champion-reliant or increase your AD by 20% or by a flat portion like Fervor. That's much healthier for the game.
In the past, Riot would have never introduced this much true damage. I don't know why it should now.