ScubaSteve1962
Contributor
Every single weekend we see divers who dive a lot (hundreds of dives - some of them quite active to the tune of a hundred a year) diving badly. It's truly incredible the stupid ideas, misunderstanding of basic concepts, illogical gear configurations and just plain poor behavior in the water they have. The longer courses give the instructor more time to try to set the student off on a path where they don't turn into one of these divers for whom "experience" gives them a license to do things poorly or incorrectly.
Perhaps it's a local/regional thing, but the very experienced bad diver is the thing that I think most instructors are trying to avoid (they're the ones with the hubris and lack of knowledge that leads to bad days and sad stories).
I don't teach as often as a lot of the other people who've chimed in, but I've never seen someone "get it" as they'd have to in order to satisfy me in 3 days. That's why I don't believe it's a good idea. If there are scuba savants, I haven't come across one; most people learn with time and repetition.
Nothing wrong with the way you teach your class, but if you don't teach your class in a way that they should have it in three days then naturally you wouldn't see that. no offense intended.