The Android 4.4 update, aka KitKat, still has yet to roll out to a large number of Nexus device owners out there. And, in desperation, some users are resorting to methods they probably don't fully understand in order to get the OTA, one of which is clearing the Google Service Framework data. This method isn't new, but it's one whose side effects are not generally considered by those who use it, at least according to Google engineer Dan Morrill.
In a reddit thread on the subject, Morrill states, essentially, that clearing the framework data is going to break stuff. Specifically, any apps relying on GCM functionality (Google Cloud Messenger) for things like push updates may freak out, stop sending notifications, or engage in other odd / less than useful behavior.Read More