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Would be goated if everyone just switched to the Signal protocol and interop was mandated, but that'll never happen unfortunately.
Isnt signal protocol just encrypting? It doesent deliver messages
Signal is a means for message encryption, and if every platform used it and then were mandated to interop, they'd have to figure out how to do the actual transfer, yes. RCS is basically this except nerfed and partially Google-owned which is shit.
This is where Matrix comes in. Fully open source and supports federation the way Lemmy does. (Even more effectively, actually.)
Matrix is more of a Discord alternative than a Whatsapp alternative though unless I'm mistaken?
For Element, Matrix' flagship client, you are correct.
Anyone can build their own clients, however, and apps like FluffyChat & Syphon aim to mimick the look and feel of WhatsApp.