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I highly doubt Messenger will have end-to-end encryption, especially that they have to display those messages on Facebook web.

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Messenger already has an encrypted mode on devices, though I agree default encryption seems unlikely.

WhatsApp's UX is pretty darn good and would be copied for Messenger. You sign-in on the web from your phone and then messages are proxied through it.

Also an option to enable web E2E with a password-protected key stored on FB's servers is still pretty darn good.

Yes but Whatsapp does not have a real web client unlike Messenger, web.whatsapp.com is just reading data from your phone.

People are using both Messenger & Facebook web to send messages, they will have to break that somewhere for end-to-end.

It just means that two (or n) keys will need to be able to decrypt the message database. The web client doesn't have to behave any differently than the native client.

If Facebook is storing your encrypted message database on their servers then the problem gets significantly easier.

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