utnapistim:
Do you know anything about safety ascent rates? How to plan a dive? Buddy safety procedures? Safety stops? Buoyancy control?
These are just some things that came of the top of my head (and there are many others).
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Bad examples since those are all things that most classes do a pretty poor job of teaching.
The typical OW class...
Gives lip service to buddy diving. You read about it but never actually have to demonstrate that you can plan and conduct a dive with a buddy. You usually spend what little OW tour time you get following the instructor in a pack.
Dive planning? They rarely even teach you how to plan your gas so you know that you have enough to surface you and your buddy.
Safety stops are explained right on the dive table but I haven't seen many OW classes that test your ability to perform one without holding onto a line.
Buoyancy control? most OW classes spend most of their time on their knees and wallow around big time during their very short OW dives with at least some agencies not even requireing the student to be neutral throughout the dive. It's another thing they give lip service to and then tell you that you'll get it with experience.
Training is good but finding training that does more than teach you to kneel on the bottom and breath is the hard part. There are certainly people that can't do that without freaking without a pro to help them but other folks don't have much trouble.
I think part of the reason that people have so much trouble with diving is that we take people who can barely swim (or not at all), who haven't spent much time in and around the water and are terribly out of shape and try to teach them to dive. Maybe the agency stance that diving is for every one is what creates the need for their brand of instruction/certification?
I don't really see why some one who is strong and comfortable in the water should have trouble learning to dive outside of the programs offered by certification agencies. Sure there are things you need to know but none of what's taught in your typical class is very complicated.