Well looks like our government (I'm French) is having the NIH syndrome as well. Why not reusing existing solutions like XMPP + OMEMO? They can invest a few thousands euros in those projects and in a couple of open source clients. Plus this will also allow the citizen to have a nice, government funded, encrypted solution.
But hey, it's not "sexy" enough. So they'll drop some public money to a big company that knows "what they are doing" and deliver a crappy platform that no one will use :) It already happened too many times.