MINION BLOCK
Why is minion block a thing? It's stupid. Why is it even in the game? Maybe I can understand making ENEMY minions block you, but ALLIED minions too? Why? Personally, I think you shouldn't have unit collision with allied minions. All too often, I get blocked by minions when I'm trying to retreat after a last hit.
If Riot is scared that people will stand on top of their minions to stop people last hitting, well, I don't think that's valid, since then you're eating free harass in return for blocking their last hit. Even then, you could just make it so that the minion moves around you when you try and walk through it then, or perhaps reduce the hitbox of the minions for allied champions. I don't know. It's just a frustrating part of the game that seems to have no purpose.
I know there's more but I forgot who