July update ruined the battery backup !!!!

What the hell is wrong with Vivo??

X200 Pro user here. Funtouch OS days are actually good if not great for me. It was neither extremely feature rich nor aesthetically pleasing but the basics were perfect on Funtouch OS. Very well optimised, smooth performace and great battery life.

The problems started with the installation of Origin OS 6. It was messy than anything else. It neither had the optimisation of Funtouch nor the features or aesthetics of Color OS. It is literally crap.

The things went extreme downhill with the July update. I am hardly getting 4hrs of screen on time that too with very lite normal usage without even touching the camera. The idle battery drain is even worst - 100% to 88% from 11pm to 6am.

Right now I am feeling like had I made a mistake choosing Vivo?