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Agree. We all know that good basics with buoyancy, trim, propulsion are things you should have down after OW course and not need to be with an instructor on AOW to improve them. But that's a very old topic.AOW and some extra dives before going to the full deep class would be a good thing. Particularly some training on good basics: Buoyancy, trim, propulsion.
I was reading this old thread about Padi Deep vs Tec-40. If you ignore some bickering about Helium and some other topics, it has good points about learning fundamentals before tackling deep or tec. And it has a nice link describing Padi deep and tec-40 classes at that time. I'm not emphasizing the deep nor the decompression part of that discussion, but rather the solid diving skills part.
What can I learn from PADI Tec 40 course?
Quoting your sig line:
"There are old divers and there are bold divers but there are no old bold divers."
Obviously the required Deep dive, and perhaps the required NAV dive in AOW should come before the Deep specialty. Not sure about any of the other 3 "Adventure" dives, especially the ones that don't give you basic diving skills--or maybe even don't require dives (like Nitrox, Equipment Specialist).
The gas planning is the only major difference in 130' vs. 100', 80' etc. There are a few other things, like hanging extra gas at 15', redundant gas supply, etc. But mostly, Deep diving is IMO the same as other diving.