the main difference is that when you trash a movie that's already complete, you're throwing away thousands upon thousands of labor hours

if a marvel movie got cancelled before production started i'd celebrate, if it got thrown out after it was completed, I'd feel really fuckin bad for all of the VFX artists, actors, and camera/sound folks that spent a chunk of their lives making the movie and now won't get any meaningful accreditation for it to help them move onto better projects than "buddy cop courthouse looney toons dramedy"