I understand that overweighting is common among new divers, believe me. What I take issue with is the allegation that PADI "teaches" the practice of overweighting, which simply is not true. Overweighting in a dive class, particularly O/W, is the result of laziness on the part of the instructor. But, that's not a reflection of the certifying agency or it's curriculum.
That said, the point of this thread was to open a discussion about the viability of formal vintage scuba instruction. Buoyancy is probably the most significant factor that would need to be addressed in such a course.
On a different note, how far would you take it? I was certified in the days when the final exam included memorizing Henry's, Dalton's and Boyle's laws as well as Archimedes' Principle, advanced physiology and and multi-stage decompression using Navy dive tables. Frankly, I loved it, because I'm a nerd and think that stuff is fascinating.
If you embrace the mindset of the time, vintage diving really encompasses a lot more than swimming around with very old gear. The Skin Diver's Bible (1963) even provides decompression chamber procedures!
Agreed, let's forget about PADI and weighting for now.
First off I'm not an instructor, but I am a very enthusiastic diver that can't help but get involved in things. I start dive clubs, round people up to do fun things like campouts and get togethers, etc.
So this vintage instruction thing is typical of the things I like to think about and start.
I would like to see it in a workshop format.
Start with a lecture on history of the gear then move into theory, depth and time, SAC rates for air supply calculations, etc.
I would then talk about weighting.
I would give homework for swimming and getting in shape.
Next thing would be gear selections.
There would be a skin diving portion.
After that either pool or ocean acclimation with vintage gear and skin diving.
There would have to be buddy breathing skills, ditch and don, more on ESA's than they teach now.
Thinking about it there would be a lot to it.
I would require at least 50 or 100 dives to be able to get to dive in the ocean with full vintage gear.
I don't know anything about fresh water quarries and how to determine how many dives a person should have for that.
I would also allow people to take the class for modern minimalist diving as an alternative. The techniques and training are the exact same.
This would allow people that don't want to chase down a bunch of old gear and get it working to get right in and still learn everything else.
Maybe I should just work to get my instructor rating and do this myself.