Exactly this. Like I said before, for a certain generation the Donner version left a big impression during their childhood. Like Batman '66 did. So everything before and after is compared and often found wanting. They consider that THE version of Superman. Or Batman. Not an interpretation. A lot of that is nostalgia.
Nostalgia in the audience is understandable, but it's a bad idea when creators let themselves be too governed by nostalgia. A franchise that's preoccupied with looking back on its own past glories is not moving forward. A franchise that's pandering only to the existing, aging fanbase is failing to create a new generation of fans. I don't want franchises to say "Hey, remember how great that thing 30 years ago was?" I want them to make us say "Hey, this thing right here and now is great!"