But - like the diversity and inclusion in the TOS cast - TOS’s liberalism (social, not economic) isn’t something that the show hit you in the face with.
It absolutely hit you in the face with it, just in a different way.
Miniskirts, an icon of feminist freedom of the time, were blatantly worn, Uhura was always in shot, and Sulu and Chekhov were front and centre of the camera when on the bridge.
Consider the famous Uhura/Kirk kiss scene. That was less of a hit in the face, and more bulldozed with it at light speed, which threatened to get the show pulled in more conservative parts of America (ironically, the same state/s would threaten the same of Arthur, the children’s TV show, over Mr Ratburn’s gay wedding so many decades later).
You could not be any more flagrant with the rules of the time, and if Roddenberry had had his way, he might have broken a few and put an LGBT character in, since that was part of his plan for TOS.
Not much of a Star Wars fan, but I assume this is David Brin’s critique?
I’m not familiar with him, so probably more coincidental than not. But you do see some Star Wars complaining that the new show is “woke” and shoehorns things in, whilst treating the conquering Empire of the first few movies as nothing deeper than that.