Everyone's So Busy Freaking Out Over Riven's Buff...
They're completely ignoring the fact they're giving a single but substantial buff to Vayne, who's a hell of a lot more toxic to the game when she's strong.
She already does tons of damage early, mid and late game so why does she need more? And her ability to casually dodge poke/attempts to CC her/escape from her/try to close in on her is already aggravatingly high so why bring it into play more often?
Is this a Master Yi-like thing, where there's this perception that she's really weak at higher levels of play despite always dominating Gold Rank and lower?