It's pretty cool to be able to tell "hey, if I was holding this in a physical format it would be a novella or more." And writing multiple things that are long enough to be novellas or half-novels means you're still winding up writing the equivalent of multiple novels which is honestly kind of bonkers. (In a good way, lol.)
But ugh do I feel you on "I want this done-r not longer." The constant tension between "I could really flesh this out into a pretty long work..." vs. "Yeah, but I could not do that and have it be done."