other servers enforce different third party comms as well.
think of the ddcs server, you even need to be on discord there, otherwise you're kicked off the server.
Discord doesn't add to the immersion of a flight sim, SRS does, and so i don't see a problem here.
In the long run, only a native solution by ED can solve this issue ... in the meantime SRS is a great addition, which is easily installed and should be a standard tool for every DCS pilot out there ;)