> This is what Whatsapp does. Signal never did and has real multi-device support.

This is news to me. Curious then, why is it not possible to use Signal desktop without a phone?

https://support.signal.org/hc/en-us/articles/360008216551-In...

> Can I install Signal Desktop without a mobile device?

> Signal Desktop must link with either Signal Android or Signal iOS to be available for messaging.