In several states, I think you just have to take a written test to get your Motorcycle license.
https://www.cardosystems.com/blog/how-to-get-a-motorcycle-li...
Looks like others that allow skipping the skills test seem to only allow it if you've completely a separate safety course (no idea how comprehensive those safety courses or skill tests are).
MSF instructors can and will fail students. New motorcycle riders are usually experienced drivers, and the exceptions are almost always kids who've been riding dirt bikes for years.