I agree completely on the AOW as a newer diver. It was useless outside of going on some more dives with an instructor nearby. I did it solely to check the box for being able to go on trips/boats that required it.
I know I'm late to the party, but this post struck a chord (A-minor) with me. In the good old days of learning to dive with The New Science of Skin and Scuba Diving [prior to there being proprietary agency textbooks] we students were subject to the collective wisdom of the Council for National Cooperation in Aquatics [a nonprofit group of many stakeholders in water sports] who deemed it necessary for a competent student of scuba to learn lots of physics and physiology of diving, and made we students endure [or enjoy] having our masks pulled off, air shut off, doffing and donning our equipment underwater, etc., all to earn a C-Card.
Once we had earned our certification, and it was EARNED, we were certified divers, trained to be somewhat self-sufficient in dealing with the common rigors of the underwater world, capable of showing our C-cards to the hardware store clerks who sold equipment, and filled our steel cylinders, and the old captains who would deliver us to dive sites aboard rickety boats that would never pass today's Coast Guard safety inspections.
We dove without benefit of BCDs, computers were evil as seen in Sci-Fi movies, diving was a dangerous past time and most of us used spear guns to protect ourselves from dangerous marine life as well as harvesting a meal or two. We dove everywhere: oceans, lakes, rivers, quarries, rarely traveling beyond the borders of our nation. Bad air was a real hazard, and smelling/tasting your air to make sure there wasn't copper, or other hazardous vapors from a faulty or non-existent filter was something we all did.
We all learned the Navy dive tables, and could recite NDLs and many repetitive dive table remaining no decompression times per specific depth for any given letter. Dive watches were necessary tools, not collector time pieces. Equipment was just as God intended - BLACK in color and made from RUBBER, or chrome plated brass.
Divers from the 1950s, 1960s and 1970s are all due a bit of respect from those who came after, so if you see someone pull out that old paper or laminated card, that just says SCUBA DIVER, believe me, it was/is a badge of accomplishment.
End of Rant