I remember Usenet in the 90s being 50% interesting conversations mostly about niche topics and 50% randomly devolving into flame wars in larger communities.
Even "Eternal September" as a concept was something from around 1993/1994 right?
Same for the 2000s era online-bulletin-board. I often go to thegearpage.net and am appalled at the amount of shilling, dismissals and disrespect, but then I remember that in the 2000s the main guitar forum was Harmony Central, which was mostly kids calling other kids moms names.
EDIT: But coldtea makes a good point about some (IMO) more recent changes: tone-policing, excessive marketing. There's IMO also a different attitude towards curiosity today.
Otherwise, my memory of early 90s internet supports exactly your conclusion. There may have been better opportunities for small discussions, but big ones devolved the same way they do today.
It was never a very placid or friendly place. There was more tolerance for vigorous debate than there is now. The debate didn’t change many minds, I suppose.