You can do that today with Matrix and whatever client you want (albeit with much more friction than what was previously possible). There a bunch of bridges[0]

You can do that today with Matrix and whatever client you want (albeit with much more friction than what was previously possible). There a bunch of bridges[0] available for pretty much any communication network you can think of and some people even go so far as to use their Matrix client for email too. [0] https://matrix.org/bridges/ https://matrix.org/bridges/