Them there be a lot of big words. We are not but simple divers
Not sure where I said anything different from your statement. In any case there aren't very good stats for the diving community. We don't even know how many people actually dive.
To your post about hours; Now that PADI switched to the self study, it has been thrust more on the student to study the materials and ask questions about things they don't understand. Admittedly that is a big change from when I went through the course. It was classroom 2 days a week 2 hours per day for 4 weeks, plus pool time, plus OW dives (drive to Ft Lauderdale and boat rides to dive sites not included).
While we don't have good statistics for diving in general, we do have good studies on the average adult attention span. It's generally accepted to be around 20 minutes. Given that, I have to wonder about the effectiveness of lengthy classroom sessions over leisurely reading at your own pace. Having said that, the theory is only a part of the overall SCUBA learning experience. The pool sessions and OW dive experiences will be the actual skill development time. No matter what agency the instructor is affiliated with, the students' experiences here will vary greatly on a number of factors, which amongst other things will include; the student's patience, the instructors ability to demonstrate skills and correct improper execution of those skills, the instructor's patience, and the instructor's opinion of "skill mastery."