I don't think it warranted a movie. I mean, even I personally wouldn't have minded a longer final fight but at the point the two are I don't think it needed to be stretched beyond a final dual that finally puts Maul to bed. Felt fitting in that respect.

I mean, okay, maybe the Obi-Wan show could've been Maul kidnapping Leia or something to draw Kenobi out (which is the only reason he'd leave Tatooine) but I think the choice they made was valid.