Can we get a federated messenger already? Sure, we have email, but the MS/Google duopoloy has effectively unfederated that, with their inscrutable block lists and nonexistent appeals processes, allegedly in order to protect you from spam. Sure, XMPP is a thing, which has been mostly dead for well over a decade. Sure, Matrix is a thing, but every time I look at it, all I see is criticism of its specifications and poor…
We do not need federated messaging at the consumer app level, we need a replacement that's available at the cellular network level (just like SMS). RCS ( https://en.wikipedia.org/wiki/Rich_Communication_Services ) is trying to do this, but it might be too little too late.
XMPP installed on the handset by default should be fine.