What I miss from those early days is the complete lack of profiles. People really were just screen names, there were no user profiles. Often one didn’t learn more about one’s fellows unless one arranged to meet up in real life (which was a thing back then). When people could not insist on a particular demographic identity or political wing, no one was looking for personal validation and discussion remained limited to the subject of the fora. Consequently, ideological battle was limited, and while flame wars were common, they usually involved nerd minutiae instead of society-wide polemics.
Compare this to later social media, where it has been taken to extremes: I’ve seen Mastodon users whose profiles are a long list of their gender identity, sexual preference, furriness, autism or mental afflictions (officially diagnosed or self-diagnosed), favored political party, and COVID masking status, and in discussion of any topic we are supposed to consider all this.