I agree with something nagel said (being a newly certified diver). OW certification is just a place to start, really an introduction. Got my OW cert one year ago and since then I've learned more through diving than I could ever expect to learn in a class room. I read about all the topics that should be covered in that class, but let's be realistic. The class time would be so long and so expensive that you'd have fewer and fewer people getting into scuba. I know, I know, safety, etc. but be honest it is still a busines. The fewer divers, the fewer div ops etc. which means fewer choices for everyone. OW class is like any other education, you will always learn a vast amount more once you're in the "real world" doing it. It's like college. You'll learn more about your profession once you're doing than you could ever learn in 4 years of college.