User blog comment:JackLSummer15/Just Dance 2020 Predictions/@comment-24872670-20190302152135

I honestly don't agree with the ultrastar option. Only people with heavy knowledge and practice of a specific song can get ultrastar, and most casual players won't do that well. Plus, if someone were to ultrastar the entire tracklist, it would take a lot of effort, especially since they would need to practice a lot of stuff, including extremes, which would take forever.

Casual players would never obtain ultrastar, so there's no reason to add something only a small handful can achieve.