New Items Only Encourage Vayne
I do not think Vayne is overpowered by any means. But I do not like the lack of diversity in the marksman role. I thought the new item changes would help bring diversity. I was very wrong.
Two new hydras and an assortment of other items which all grant health was introduced. Brusiers like Trundle and Talon are stronger now because they deal the same damage but are much tankier. Armor items throughout the game was nerfed, but base armors were increased as compensation. A new rework has introduced 10% critical chance reduction.
Critical Chance reduction greatly harms auto attacking adcs like

Armor item nerfs hurt
who excel at bypassing armor
Base armor increases hurt the early laning power of
who now has to deal with the Leona with additional base armor
Yet a massive increase in flat health and dps bruisers only encourages utility based hypercarries like
who can kite effectively and deal scaling damage.
Why. Why did this happen.
BONUS:
is also a lot stronger now but she's had a fair share of unhealthy playstyles when she was in favor