I've said it once, I'll say it a thousand times:
If Riot needs to hotfix a champion or completely remove a part of the game because it's too weak or too strong, there is a serious problem going on behind the scenes. The exact nature of the issues, I don't know. The testing team could be dropping the ball, there could be poor communication between the testing and balance teams, the balance team could be ignoring the testers, I really don't know, but something at Riot isn't running smoothly.
Chemtech drake and now Zeri. Glaring issues like these need to be sorted out before release, or you don't go through with the release. The balance team and the testers need to be on the same page, and they are clearly not.