Naven
Answers
Can you use more than one messaging app at once?
Yes, and most people do. There is no conflict — a browser-based one in particular costs nothing to keep open alongside whatever is already installed.
The realistic path onto a new platform is alongside rather than instead of. Nobody moves a whole social circle at once, and a tool that demands it will not be adopted.
What usually happens is that one group moves — a club, a class, a family — because the old tool failed them in some specific way.
A web-based messenger is particularly easy to run alongside: a tab rather than another icon and another background process.