It is often sold as a HAMB drill that will improve your game by practicing it every day for months.
Can't it be useful in some other fashion? Can't someone develop a calculatus-eliminatus method of learning from it? Something like:
If you cannot achieve 80% or better, review stroke with video;
If on stop shot,
cue ball spins right after hitting object ball, you are not hitting center ball---hit more to the right (and vice versa);
cue ball follows object ball, you are hitting too high on cue ball---hit lower on cue ball;
If you miss more often to one side than the other:
try aiming more to the opposite side;
try finding your vision center and line up eyes and cue stick accordingly;
if missing to the right, move back foot to right (or is it left?);
buy Joe Tucker's 3rd eye to determine if your center is not the real center;
and so on . . . . .