There's like 80 years between Enterprise and Disco, and another 80 between TOS and TNG. Since they (probably) won't fill up all of this with more and more series, there's plenty of scope to mine them for content, especially with one-off films.
Not all the voice actors look like their characters. Tendi and Rutherford have this problem I believe.
Buuut, longer form lower decks could work quite well I think. Those characters work in a more serious setting, and their ability to insert levity into those settings works really well. An animated lower decks movie could rock!
Look, the man also directed First Contact (the movie, not the episode) and Those Old Scientists, which are generally well received. I think we can begrudge him one ghost-fuckin' episode.