Except everyone misuses such a thing, privacy gets violated, often don't test well for battery in many different conditions, and then users end up with a shit experience yet don't have the technical expertise to understand why (or which app is causing the problem). Android is particularly difficult since you can have a service running without an app present, so disabling it isn't very intuitive.

I think Apple has done a better job at this balance by not letting people shoot themselves in the foot at the cost the odd useful service not being possible.