I started diving in the late 50's. No certification required, heck I bought my first scuba gear from J.C. Penny Healthways brand. I was finally certified in the mid 70's with NASDS, we did the dive into the pool and put all the gear on, everything was put on the bottom of the pool, Open water we did ditch and don's swap masks, turn the air valve off and everything else our instruction could figure out, even a regulator failure where we took the bc off and took the regulator off the tank and breathed from the bubbles directly from the tank. They use to teach you about any type of emergency you could have. OOA accends. Also the courses were a lot longer in length (weeks instead of days). We all had a lot of fun in these classes and looked forward to them. More pool sessions, more classroom than today, more open water sessions.
I guess there were too many problems and they just keep taking necessary things out of the courses to make them easier. My dad taught us to dive in the late fifties and he was a navy instructor, now that man had no mercy!!!!! I think he expected us to be UDT. Course the Navy tables were the bible and even though I have a computer and have dove with one since the ScubaPro bend-o-matic, have always double checked againist the tables, then the NASDS wheel, and I now have a PADI calculator. I have had a few things happen through the years and have never paniced (knock on wood), I do give the training my dad gave me and the lengthy NASDS training the credit for this.
I do not see where a two day course and a dive can give you a dive certification. I have done a lot of resort diving through the years and have seen so called certified divers not have the slightest idea about most anything, they even have problems putting their gear together. I just remain quite and in the corner, if you offer to help then you become their instant buddy sad to say. I end up diving alone which I prefer in a lot of these cases.