All other popular sports are a game. They invoke audience interest, due in large part to strategy and the unpredictability of what will happen next. They are considered fun to participate in. Skating does need artistry/performance or else it's just acrobatic speed skating. Gymnastics is more interesting to watch in comparison to that.
Not just gymnastics! All Olympic events of acrobatics are more spectacular than FS: ski jump, aerial, ramp, freestyle; while it takes a trained eye to tell apart the quality of FS acrobatics. If there was no music and/or no story then it wouldn’t be just boring. It would be unbearably boring to watch!