I think you are having trouble recognizing the fact that the vast majority of people in the world do not live - much less train - "every day in Hawaii" like you do. For a NJ pharma executive and his family learning to dive or a Colorado lawyer and his wife... two hours a night, twice a week, for 3-4 weeks might be the ideal schedule for them to learn to dive. Further, if someone is seeking to get certified for a vacation they are going on in eight weeks... the length of the course is not "standing in their way" of anything.
Not saying that pool/academics should drag on incessantly... but there's no reason to rush through it if work/life/vacation logistics are the rate limiting factor anyway.
I'm also struggling to reconcile your desire/belief that - ceteris paribus - shorter is better when there's now data from ~700 student divers, the majority of whom seem to agree that's not the case based on their own experience.
(Just a note: I would like every single post from every single poster in this thread, but for whatever reason, I cannot like things right now die to some weird browser dealio.)
I understand the exceptionalism of being in Hawaii. My point about Hawaii is that it is one of the few places where "not dive certified" is not the big deal not being certified is in other places (from a practical standpoint lie getting fills and whatnot.) People who work fulltime as divers (fishing, tropical fish collecting, hull cleaning, etc. etc.) just don't have to get certified. I was diving with a guy on and off for a couple years on our own boats before I realized he did not have a license.
He had all his own gear, and tanks, etc. and he had never bothered to get certified. And this is from someone who builds their life around diving!! If getting certified has little (or worse, negative) value for someone who values diving greatly, then there is something wrong with the approach to teaching diving. Six week courses?? Additional material for the uncertified diver?? Adding content to an Open Water course? Self publishing additional material for open water courses?? What kind of ego makes someone think that is of any actual value to the only necesary person in the dive certification process??
Hint: the only necessary person in a dive certification process is the student.
It was an eye-opening realization to figure out that what we as instructors do is completely unnecessary, and it completely changed my mental approach to teaching. We give are taught to give lip service the idea of value during the IDC/IE, and then once we become instructors, guys like that CD (Course Director) I mentioned above (whom makes his living teaching and evaluating
instructor candidates!!!) completely forget his entire raison d'etre. Our role not to teach diving; it is to help people learn to dive.
We, as instrcutors, are simply not a necessary part of the process at all.
Any time an instructor deigns to open their mouth to bestow their wisdom on students, instead of realizing that entire role of the instructor is instrically parasitic on the students desire to get certified, bad things result. Humility (well, that, and empathy) in the role of the instructor is key.
Talking about humility that may sound strange given my own tendency to positively assess my own worth as an instructor, but my entire worth as an instructor comes from my awareness that what I do is completely replaceable by nothing at all, and working from that realization outwards.