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I wonder if that would allow Signal to become interoperable with Whatsapp?

I wouldn't want any cross-talk between my secure messaging app and anything that is owned by Meta.

Your comms are only as secure as the node receiving them.

Yes which is fine given that you get to choose what you send to which app.

FTA: As reported by Heise Online, Signal and Threema will not establish connections allowing for interoperability with WhatsApp.