Im not an old timer so I cant speak to your question directly. However, I had always heard of the old boot camp style dive classes and wondered why no one taught that way anymore. Ok, actually I understood why no one taught that way anymore but I felt cheated. I can understand not trying to scare people out of the water but the end result was diving on Prozac
no rough edges, nothing upsetting, diving is all warm and fuzzy. For me the result was not a false sense of security but a nagging suspicion that I didnt know enough.
Then came Tech 1 (DIR-F didnt exist yet). Andrew and Nick proceeded to kick our butts up and down Alki Beach. I dont know how it compared to the old style classes but it was a full contact training event. I was surprised that the first portion of the in-water was just learn how to dive. I was also surprised just how much I needed to learn, no one had ever really held me accountable for how I dive. Problem, solution, practice, repeat (and repeat, repeat, repeat). Fantastic.
I love DDs comment "What you are going to learn here is in the first 4 pages of the PADI OW manual". Its hard to imagine anyone claiming to have invented proper buoyancy control, buddy awareness, or even back plate and wings with a straight face. I never got the impression during class that they were showing me something new, quite the contrary this was all stuff that I should have known (proper buoyancy, trim, etc.). I had heard most of it before, it was just buried under a mountain of fluff.
Emphasis on basic skills and student/diver competence isnt new; its just out of fashion.