I'm not talking about visual overhauls, those are pretty amazing.
But im talking about aatrox, akali, warwick, mordekaiser, etc.
if a kit is toxic, keep them like you have kept azir and move onto a new champion. Don't take away my old champion, change it and then GUT that as well, for fucks sake.
Partial reworks and mechanic updates are fine, (ex. twitch Q/ashe Q/etc)
If you want new mechanics make new champions.