As an infrequent user of iMovie (and a past user of Xcode), I think that iMovie really gives Xcode a run for its money in bad UX. How that app got out of the lab like that is profoundly beyond my understanding. It’s not just bugs as such, but actively user-hostile as though a team of people really worked hard with the goal to make the most infuriatingly inconsistent and unintuitive app imaginable.