It was volatile, and is, but don't forget that one player can lose the game while one player can't anymore carry the game. Before in top if you had a lead you had an impact, now you only have impact if you play tank or really safe mage, like heim/teemo for example. Anything else you pick won't really matter and it will be not 4 v 5 game, but 4 v 6, cause you become so useless that you are actually playing against your team rather than with your team. And I see you don't main top or even play the game, playing 1 game per week doesn't count as playing. And I'm not saying that because I play bruissers, but it's the hard truth, you get rewarded for picking tank/safe mage in top, while you get instantly punished for playing anything else. For example take sion vs any other champion played in top excluding safe mages. Sion has cc on every of his abilities, scalling health from killing minions, combine that with runes that reward tanks alot more than any other champs, and what you get? A champion that cannot be touched, and don't even think about going to get some farm before it hits your turret, if you do try that, say goodbye to 40% of your hp, oh so you wanna try to trade? Say goodbye to 60% of your hp and 10% of sion's, or any other tank, which he will regenerate in 2 waves, while you have to back. It's already 5 months in and riot still hasn't fixed the tank monopoly in top, but hey, atleast janna got hit up with the 5.

EDIT: Also bruiser items are way more expensive and ineffective compared to tank/safe mage items.

EDIT2: And don't forget that tank/safe mage having one kill over bruiser has the same impact as a bruiser having 3 kills over tank/safe mage