I don't see where the problem is with discord. There's no app to install (unless you want to); the server can be visited from any browser. I'm not sure what level of verification the server needs, but it's likely only email verification, so make an account with a burner email if you're worried about spam; although in my experience, discord doesn't send out any spam.
If you got banned from the server, then you could just make a new account (but please don't use this for trolling/flaming/etc)
Unlike facebook/twitter, discord doesn't ask you for your phone number or other personally identifying information, and it's a more intimate setting than a forum, which makes it ideal for actual personal-level interaction with the CM/other players. And unlike the line chat rooms that people use, the discord server is publicly available to all players, so, like the forums, it is an ideal place to release new info about the game. Anything "set in stone" should be released on the forums/ other platforms, of course, but for "teasing ideas" / speculation, discord seems to be an ideal, all inclusive environment.