I think buffs and nerfs should only be necessary to champions that ABSOLUTELY need it. Champions with 40%+ ban/pick rate. Champions that show trend that they are an actual threat. As well as buffs should only be the case if their WR reflects a weakness as well as their individual WR's. If the champion isn't absolutely broken, and you lose, then its because you just aren't good enough. :))
This is coming from someone who one tricks azir. Shit sucked. Got tons of nerfs. But you just learn to stop complaining after 10 nerfs in a row and just learn matchups. Now have a 65% WR with whats considered one of the worst champs in league.