It’s so bizarre to read this in the present, knowing how incredible TNG was, but I get it - the original crew WAS Star Trek to them.
The dedicated fans revived this series in syndication, well after it had gone off the air in 1969, and felt attached to the characters that they had obsessed over between then and the 1980s. Like modern fans, they thought that departure from what they knew would ruin it.
I wish I could go back in time and tell them that TNG is going to rock.
But also, so what if it turns out to not be good? You can’t know ahead of time in the same way no one knew TOS would be good. Plus, if being progressive was remotely anything these fans valued in Trek, there was plenty of room for improvement. Like, how has Trek fared against the Bechdel test? I’d imagine it takes up until Voyager that you start to get consistent episodes that pass (I’m not sure how often Jadzia-Kira and Troy-Crusher conversations happened)