its more what the game has swung towards, it doesn't have to be some insanely snowballed riven just a 2/0 fiora or irelia with normal bruiser items that are super overtuned (death dance, jaksho, botrk right now, but there seems to always be something) and they just always seem to have disproportional impact from their performance due to how much better bruiser items and runes always are than every other classes.
It never feels like bruisers have to work hard to have 1v5 levels of impact compared to every other class, simply because when they get a small lead all their items are so unfair (both give a ton of damage and make them unkillable) no one can stop them.
I just really don't agree there. I don't see normal or slightly-elevated income fighters hard carry games.
I think jungle is slightly overtuned as a role because of how much impact it has on the game overall but it's not because Viego or Jax or whatever just wins the game at 20 minutes.