On the other hand there is an uncontrollable mess of bad apps made even by reputable vendors such as Samsung that just sometimes enter whatever weird state that

On the other hand there is an uncontrollable mess of bad apps made even by reputable vendors such as Samsung that just sometimes enter whatever weird state that is impossible to debug and just drain battery like there is no tomorrow. More advanced power drainers don't drain battery themselves but hide in shadows and just keep the phone in "awake" state, essentially halving it's battery life and are very hard to catch and impossible to fix (except for uninstall). I'm both hands for ultra aggressive battery saving modes because if one or even ten apps malfunction it not good but acceptable, if in the evening of day 1 I have 5-10% of battery on the phone that is verifiable capable of running for 2 days, now this is unacceptable. It it renders Skype on mobile unusable, because it is always killed by battery saver, well to hell with such crappy app, their competitors work just fine in the same environment.