@Marcus Rohrmoser 🌻 Some platforms, like Hubzilla, actually tell you that the thread (conversation) you are commenting on is from a forum. It helps provide context and also lets you know your post will be distributed to forum members in addition to your own followers.
@julian It’s interesting how different platforms implement things. Some platforms, like Friendica, tell you which platform someone is using by showing a little icon next to their name on all of their posts (Mastodon icon, Hubzilla icon, potentially a NodeBB icon, etc.), whereas Mastodon makes it appear as if everyone is on Mastodon. Some Mastodon users are not even aware that they are talking to people on other platforms.
The reason why I say indicating that it is a forum or group discussion is useful is not just the cultural issue, but also because replies to forum posts are distributed differently than a normal post. You are not just replying to your followers and the person who posted, but also to everyone following the forum (or forum category).
But, this is something that is nice to have, and not needed. It just is useful information to have. And I doubt that platforms like Mastodon will make such a change anyway.
It’s also interesting to see how platforms that pre-date Mastodon implement things versus platforms that came later and are influenced by Mastodon.