I agree that there's no harm at all in disabling/deleting anything from any phone that the users has no use for, or scaling it down (GPS for example) to getter better performance or battery life.
However, it's certainly not the case that ALL Android phones have the same issues. In fact, I'm sure that there's plenty of S6 users who've disabled nothing at all and get what they consider good battery life. There's so many factors involved, such as network coverage, GPS and so on. I have the G4, and all I've done (other than delete a couple of pre-installed apps I don't use) is put GPS into battery saver mode. On my Z3 before that, I disabled nothing, as the battery on that thing just went on forever.
My point was simply that putting a 2500MaH battery into a phone approaching 600ppi and with the fastest processor available will not, under normal circumstances at least, equal decent battery life without employing some restrictions. I don't want restrictions.