> As an Android user, all I really want is a secure way to communicate with others by default, without having to figure out which secure messaging app I have in common with each of my peers.

I'd prefer the opposite: an OS with _no_ messaging app, and let users pick their own (both for Android and iOS). Expecting OS vendors to ship one out of the box is asking for a new IE-like scenario where whatever big tech companies pick becomes the standard, no matter how good or bad it may be.