I agree but I'm confused how you can use Signal in the same sentence then.

Reminds me at duckduckgo: makes claims and builds big branding about security but nobody (including me) ever questioned them. (Regarding article not at hand but of course also on HN.)

The first question I would ask: how does Signal finances itself when the service is practically "free"...

For the rest I totally agree: I could also convince some for XMPP/Jabber while at the same time it lets me question my relationship to those I couldn't move. I mean it's not that these days you couldn't install a second app if you already have 50 useless i.e. "coupon" apps installed anyway.