A lot of people are going to start using XMPP/OMEMO.

I thought most of these proposals were around doing device-local analysis and reporting (I suppose specific clients might not, but if they can mandate this at the device level, and make it default on iOS and Android, they're going to get almost all users.)

Device-local, yes, but I thought it was only for apps under Apple's direct purview, ie, iMessage.

No reason an XMPP client wouldn't be forced to include this as well. Reminder that iMessage and Signal are encrypted communications but are surely a target of this sort of lawmaking.

With XMPP though you can use a smaller FOSS client on a desktop PC. iMessage and Signal force you to use a recent closed source client on a phone.

If the person you are chatting with doesn't follow suit, you'll still be analyzed, just on their end instead.

Try Molly for Signal on Android.

I probably won't, I don't have a signal account