Unfortunately, bare-bones Android may get barer and more awkward over time, if they migrate more services from the core OS into "Google Play Services". As an example, the new geofencing APIs that they announced at the last Google I/O (intended to replace the buggy core "proximity alerts") are part of "Google Play Services", not the core OS --- and therefore not available on devices which aren't part of the Play borg.

(To be fair, their announced reason for this is that it gives them a way to make these APIs available on devices that aren't getting regular manufacturer updates. That said, I'm sure it hasn't escaped their attention that it also adds a point of differentiation between Play-enabled devices and, say, the Kindle Fire...)

cite: http://developer.android.com/training/location/geofencing.ht... (Note that step one in using this API is verifying that Play Services is installed.)