The problem with the 90s anime is that it had much too many filler eps that were totally unnecessary and made the series very draggy and long. While Crystal's problem is that it does not have enough of these character-driven eps hence it's too short.
I certainly see your point. However, my original post was talking about how interesting it is that Crystal is criticized for its lack of filler while other shows like Steven Universe or RWBY are criticized for their "filler" whether or not they're good character-driven stories.
Of course, for the latter case, this is because said shows are in progress of being aired week by week (usually) and the hype combined with the inherent impatience of fans leads to us having specific expectations of the show.
It's only when we're able to rewatch a TV show in retrospect that we are able to appreciate all the filler episodes for all they're worth and thus is the case with Sailor Moon as we know where things are going and we know how things are going to turn out.
I guess I was thinking about how if Sailor Moon was adapted the same way it was in the nineties in today's digital age, we wouldn't exactly have the patience we have now with the monster of the day formulas. We're more forgiving because we both grew up on it and we're not waiting for each individual episodes, especially with Viz's releases.
I'm certainly not going to act like Crystal didn't do anything wrong. I'll say that the Four Heavenly Kings subplot was a fairly interesting attempt at adapting a plot point that Codename Sailor V heavily hinted at but it only ended with all of them being stabbed in the back by Metallia so soon. A case of "good idea, lackluster execution" syndrome.
In defense with the Manga's character development, we see each arc the characters go through over the course of all five sagas rather than small episodes that show the development bit by bit to pad out the seasons.
Perhaps what would've been best is if all 26 episodes were for the Dark Kingdom arc exclusively and they left the Black Moon arc for a potential Season 2 if Crystal panned out. This would've allowed breathing room for the Manga material while extra material could've been written exclusively. Similar to PGSM but more faithful to the Manga nonetheless. Hell, potential filler aside, I always wondered why they adapted two arcs for one whole season to begin with. Did they ever make a statement about it?