I definitely need to see this one of these days.
I think the missing pieces plays just fine as a companion film, and FWWM is pretty well paced as it is (for a movie as long as it is it just flies by for me). So I do wonder how different it would feel as a 4 hour sprawling cut but I love the material so it would be cool to see them cut together. Maybe next time I do a full watch though of the entire series I’ll go for that version. Haven’t done so since The Return came out.