"Why doesn't Riot nerf everything"
Remember when people were like "why doesn't Riot just nerf everything lul??"
Then they proceed to pretty much nerf everything that was strong at the time (tanks, mages, ADCs, jungle). And with each change all of the players were like "omg, I meant the other roles, NOT MINE!".
That's why Riot doesn't nerf everything, cause no1 actually gives a shit about balance and just wants whatever they play to be strong and no one likes their role being nerfed.
The only role that has gotten actively buffed is bruisers (oh yeah, bruisers being "unplayablely weak" was also another thing ppl claimed at the start of the season), and indirectly buffed has been Assassins (those 5 damg buffs for duskblade compensation were pretty much damage neutral).