> In that case, OS access becomes moot.

Not really.

1. A non-Google OS can shut off background running access to Google apps, as well as supply Google apps with mock location data and other data

2. Google does other things to the OS that drive me nuts. Like allowing apps to restrict screenshots. I own the phone. If I want a screenshot, it should screenshot. This is not something for apps or Google to determine, and if the OS listens to me (not the app) it should allow screenshotting the display 100% of the time regardless of what the app cries about.