BoulderJohn - getting a little off course (but I opened the door...LOL) to me that is a great example of a bad instructor. When learning new skills on a tec level, all core skills should be done (neutrally buoyant) shallow before deeper and students should get briefed then the instructor should give a skill demonstration so that the students can see how its done and has tried it once and received feedback (what was done right/wrong and how to fix it). Then student can go and practice , once skills are mastered (so student thinks) then they can go for evaluation and attempt to complete dives. Task loading, solution thinking and repetition of skills becomes more and more every dive after that and depth increases as well. Again, I have seen a lot of poor tec instructor (can't do skills neutrally buoyant, can't communicat with students, just signing off on divers) out there, so Tec Instructor should not have any more weight, still need to interview or do a dive with the person.
I personally teach core tec skills (Buoyancy, trim, propulsion, control, A/S) on the Recreational level from the ground up (OW - PPB - Drysuit - AOW an on). With this approach divers will have the foundation for whatever path they take in SCUBA (photography, wreck, tec, rebreather etc...). With this approach, specialties do mean something and with the foundation of core skills, stundents can focus on learning new skills, techniques, muscle memory etc., so they will get a lot out of the class. When we don't have the Control (buoyancy, trim, propulsion) the learning curve is a lot greater.
Here's what we see locally. Besides classes being taught with a lot of hand holding and not being neutrally buoyant, the other problem I find is that the instructors do not know how to structure the programs. I've seen multiple times where an AOW class does Navigation segment all on a platform (surface swim out, descends, skills, ascends, surface swim back). Then, same approach (surface swim out, descends, skills, ascends, surface swim back) for the Deep Dive but now on an attraction. Don't understand approach but maybe its environment (quarry) related where instructors do these dives because they can, but what is this doing for anyone? How about putting a full dive together (rather then a short 25 minutes) that encompasses all the skills that you need into one complete dive. Never seen this approach from a boat!