Yes, I agree with all of that to a point. Except that the the courses that don't involve safety and efficiency as diver don't really contribute to one's buddy being someone who is safer now to dive with. Maybe these "other" courses should be taken outside of either agency's MSD? Debatable. Still hoping for someone experienced in both agancies to reply to my question about NAUI AI/MSD vs. PADI DM/MSD (with core specialties). Just trying to see how my education stacks up.
Why do the other courses or subjects need to be taught outside of the MSD? The point of MSD, in my opinion, is to make well-rounded and competent divers. That's why 3/8 of the subjects are flexible while the other 5 are required. In the US Navy, a Master Diver is one who has experience in all aspects of diving, not just the basics and emergency procedures. Why can't the recreational MSD mirror that idea?