During my engineering classes, the example was made time and again, that NTSC was accumulating a specific drift, which got cancelled on PAL. Now I was too late to the States to see any NTSC TV in action, it was all already digital, but plenty of acquaintances have, and all agreed that "our (analogue) TV is better than their (analogue) TV" which may or may not have been the case, for this and or other reasons.
What I do know of a friend who worked in video editing, back in the day for MTV, was that for broadcast, everything had to be smashed such that all TVs could show the image. He gave me a VHS of Aerosmith once, saying the quality of that was going to be way beter... He couldn't bear to watch his work on broadcast TV.