So basically, play a tank or you will lose.

The armor nerfs, the repeated cinderhulk nerfs, the nerfs to the top tank junglers, the fighter buffs, the persistence of pen items, the buffs to AD itemization, strong new AD items, the addition of runeglaive, sated devourer, all come to mind.

Seems like Vayne's win rate and play rate would have something to say about that, as well as the sub 50% win rate of 2 previously top tier tanks.

This just in... there are champions who are great at shredding tanks and tanky bruisers. It'll be a week or two before people all figure this out. Until then it's just gonna be whining about "OMG TANKS OP!".

I think the new items were just a relief for the same boring 3 items every Tank/Engager was forced into building. Having viable +HP builds lets you interact more with the team fights rather than just being a ball of stats.