Because you can add only what you want and restrict notification and other data transfer, auto turn off when not in use, etc. It is the constant google chit chat that kills battery. My play app keeps nagging it wants more permission to function better but I just deny it. also it is just play service, no gmail, no google drive, etc. and I didn’t have it snooze power this week but only 3% play aervice use since sundays charge.