I picked up a oneplus 9 last year and it's inarguably the first smartphone I've ever had that I haven't felt like I need it on the charger constantly. I started with the original galaxy phone then got bored after galaxy 5. Switched to LG until they went belly up (loved LG phones BTW. Battery still sucked). Then last year is when I switched to oneplus. Holy shit what a difference. A lot of it has to do with their modified version of android, OxygenOS. Like you were saying, it takes care of a lot of the bloatware issues and constant tracking and such and gives you complete and transparent 100% control over what your phone is allowed to do. It also defaults to a very minimal resource usage so you don't actually have to change much of anything.

Charges from 0 to 100 in 30 minutes. Stays charged for more than two days if I only use it for phone calls. Superb battery.