There’s nothing intrinsically bad or “archaic” about forums. It’s the forum platforms that sucked for some people. It took some thought and work to manage a forum. The only advantage a Discord server had was that it’s simple enough, a brain damaged squirrel could run one. It saved you from having to do your homework and just created a simple plug-and-play space that required no skill on the owner/mods part.

Not sure if Stoat does audio rooms, but I know you can use SonoBus for that