Tv shows are still being shot on tape, only now in HD. Some 70’s sitcoms shot on tape look really bad now for some reason, especially Norman Lear productions. Maybe the video masters on those need restoration?
On the flip side the first two seasons of Saturday Night Live look great for their age. I’ve only seen one video glitch so far, and I’m not sure it would even have been visible on a CRT. You can tell NBC didn’t allocate their best cameras to the show early on though. It’s a shame they didn’t remaster the film inserts because the telecine they had at the time was pretty awful. (I could get better results shooting a projector aimed at a blank wall.) Whether that footage still exists is anyone’s guess.
It’s a shame a lot of Universal’s 60’s/70’s tv output shot on 35mm hasn’t been remastered. Some of what I see airing on Cozi TV are from really old broadcast video masters.