Or maybe we DO know exactly what we're talking about, and have the scientific evidence to back it up.
This has been hashed and rehashed to death here. The point is this...MOST pros who have an elbow drop, move the elbow down AFTER contact with the CB. They have superb timing which allows them to still accurately contact the CB (which is the biggest argument against doing it). The vast majority of amateur players have no such ability, nor can they duplicate the pro's timing. Here's the ultimate truth...there are probably a dozen ways to skin a cat, but there are a couple that are a LOT easier to be accurate and repeatable. They both start with a sharp knife! Whether you agree or not, the truth is it's just simpler to develop an accurate and repeatable stroke WITHOUT the elbow movement (which does nothing to provide anything "extra" to the stroke). Most players wanting to improve their stroke look for a valid way to learn something repeatable and sustainable. It is hard work, but the rewards in the long run are worth it for most players who seek quality instruction.
Scott Lee
www.poolknowledge.com