Comment by Ajedi32

That seems like a good idea in the sense that it's better than separate apps for everything, but it's also probably the wrong level of abstraction. For example: what happens if you try to create a group chat containing an RCS user, a WhatsApp user, and a Telegram user? Ideally it would just work, but I don't see how that's possible without support for such a thing at a deeper level than just the UI layer.