I totally get your point. The difference is that stories like Dracula, Alice, Cinderella etc. don’t nearly ride on nostalgia as much as Sailor Moon and have more profoundly different variations of its story and imagery to keep things fresh, particularly because their creators have passed on and most of these stories are public domain. For example, the differences between Tim Burton’s Alice and American McGee’s Alice are massive despite both of them being darker versions of Alice in Wonderland. And that’s not even mentioning the fact that there’s also new original stories featuring these characters and sometimes even sequels written after the fact (albeit not by the original creators).
To give a non-public domain example: there's Agatha Christie's "And Then There Were None." In addition to at least three stage adaptations and two radio plays, there have been four direct English adaptations, five non-English adaptations, and one English film (Mindhunters) that's more of a "loosely based on" take, plus a dozen or so TV adaptations from around the world. There isn't a ton of difference between one adaptation and another; the reason there are so many versions is simply because it's an iconic and incredibly popular mystery story.
Then, of course, there's Scooby-Doo: fifty years of television and film incarnations that, for the most part, are just variations on the same basic monster mystery of the week formula. Occasionally they do something to "shake things up," like adding guest stars or new characters or making the gang a group of middle schoolers, but the series' basic tropes are always in evidence. In fact, it's when the series has most deviated from the tried and true that it's been the least successful in the eyes of fans. People crave familiarity.
I think one of the major criticisms of Crystal was simply the lack of "filler" episodes. As long as Toei can devise some new monster-of-the-week shenanigans for the next reboot, they'll be fine.
I think most of us wouldn’t feel as fatigued after the 100th version of the Dark Kingdom arc if they start putting a new spin on the story... Like changing the order of the Sailor Guardians awakening, having Usagi know she is the Moon Princess from day one, etc. But it’s clear from this topic that not only is Naoko most likely against radical departures to the story, so are Sailor Moon fans. But good luck to Naoko and Toei selling the same exact story with little to no innovation over and over!
I'm honestly not even sure that "radical departures" are even necessary. I mean, the Nogizaka46 musical was probably the most manga faithful adaptation of the DK arc we've gotten to date, and because the production was just such an absolute joyful spectacle, I absolutely loved it. I think heart matters almost more than creativity? I mean, my biggest complaint about the Viz re-dub and Crystal season 1/2 was how soulless and bland it all felt.