I agree about changing nothing but frame rate, leaving lighting and other production values in place. It still adds a level of cheapness/cheesiness. Aside from Twilight zone I've certainly seen TV shows (sorry can't name 'em offhand) that had very nice lighting etc. but for whatever reason were shot on video and it still has that barfy interlaced look. Just like people who have their TVs set up incorrectly so that EVERYTHING looks that way no matter how it originated/is actually being displayed, if you're drawn into the material you get used to it after a while, but it never looks "good" and if you stop and think about it again you realize how nasty it is.
Yeah, old Star Trek looks kinda cheapo, but I think that was a product of budget and other constraints. I remember reading somewhere they had what they had to work with. . .lots of grey walls. So the DP would like those grey walls with various colors depending on the mood of the scene (red for romance, etc.).
Even given those 80s and 90s sitcoms, something like News Radio still looks several notches nicer than Growing Pains or Fresh Prince. Maybe set design/lighting/etc is done better on the one vs the others, but I bet a big reason is, again, the interlaced quality of those video-shot ones. I'm pretty sure Family Matters switched from one acquisition format to the other during the show's run (can't remember which way they went----I would guess film to video) and again, instant cheapness.
Some of that definitely is the the video edge enhancement too.
It's not that it's "interlaced," it's because it has 60 movements per second. 60p looks the same.
NewsRadio was shot on 30 fps film. 30 motions per second.