Nowadays studios really lean into the idea of establishing an expanded universe and canon, since then it becomes a recurring revenue stream and all that. So, I wonder if this is an aspect of that trend, just a different way people tell stories and, as a result, consume them.
I think people ignore 90’s disney cash grab sequels mostly because they were so garbage that they didn’t get integrated into the cultural zeitgeist (and also, people who loved Lion King when it came out were too old to care about the sequel).
Stuff like the Star Wars prequels is not quite at that level of badness, might be marketed toward everyone, so it enters the general conversation about the movies. Of course, it is possible to not engage in that stuff, but then, I guess people who are talking about Star Wars in 2023 are interested in the whole thing, right? You can only think about 3 movies for so long, haha. So, I bet lots of people saw them movies, have fond memories, and then moved on, but they aren’t talking about it anymore.
But for new movies to make old movies worse used to be an uncommon attitude I think. I remember in the 90s and 00s, lots of movies had really shitty sequels, often straight to DVD, but nobody talked about these cash grabs ruining the original movie. For instance Aliens 3, Alien Resurrection and then all the AvP crap... some people like these (I think Aliens 3 is defensible FWIW) but a lot of people really don't. Still, nobody talks about Alien or Aliens (e.g. 1 & 2) being ruined by the later movies. Aliens 3 is frequently criticized for the way it killed well-liked characters from Aliens, but that doesn't stop people from still enjoying Aliens. People just choose to ignore Aliens 3. And why shouldn't they, because Aliens 3 is canon? That's just a legal IP relationship, that doesn't matter.
And Disney has dozens of straight-to-vhs/dvd cashgrab sequels of their classic animated movies, people who don't care for them just ignore them and they aren't said to ruin the originals. There used to be a general understanding that sequels are very rarely good, people were pleasantly surprised when it was otherwise and nobody said their life was ruined by a bad sequel. Because who cares about cannon in animated disney movies?
I've seen Lucas's Clone Wars, but if I watch the original Star Wars I'm not compelled to relate it to the Clone Wars movie. By simply choosing to ignore it because I don't like it, I free myself to imagine my own clone wars.
I think new movies ruining the originals is some relatively recent cultural phenomena that was brought on by internet culture's obsession with canon. The existence of popular sites like wookiepedia both evidence it and drive it. If I'm wrong and it's not an overabundance of respect for IP laws that is the root of this, then why isn't bad fanfic also said to ruin the original?