What is your demo? In my world it's quite different. Isn't Whatsapp proprietary? And I know few that will bother with signal these days. I've started getting obvious spam invites on it as well so...
RCS should just be the standard. There is no reason to argue that.. it doesn't end the apps you use but many of us are tired of multiple apps.
I have to agree with most people, arch is probably the way to go.
But given the subject I'm gonna piggy back on you and ask about KDE Neon. This is what got me back into desktop Linux after installing it on an old crappy tablet.
Now i currently run it on a couple older but upgraded AIOs and even my server that primarily does VMs.
If i understand it's a little more bleeding edge than people would normally like but I'm curious the community thoughts on it as i don't hear much. Am I missing out not running arch or mint?