What is up with Riot's rework?

Literally starting from the assassin rework things went downhill wasn't the fun that she used to be and that everyone loves. I don't know too much about. wave clear was rediculous. LB and Rengar got reverted but not Kat. was someone long needing rework. It was shit wasn't the fun risk-taking, mistake-punishing champion she was. Her wave clear is too safe and strong. While at the same time her shroud gives lots of jail out of free card for errors and way too much sustain.