> drummers will actually enunciate every hit. So you could simulate a drum roll with your stick in the air without too much effort.

The first part is true, the second is not. Open rolls use double strokes, where you hit the drum twice with one wrist motion. That's not possible if the stick isn't rebounding.

Playing single strokes at high speed wouldn't be possible here either. You're doing twice as much work if you have to pull the stick back up after each stroke.