M14P
Trimming, on the other hand, is very poorly taught but has never been a big issue when it comes to stalling. An aircraft can stall whether it is in or out of trim; your assertion that 'in most cases the aircraft was grossly out of trim' is pure conjecture and more than a little silly.
I would suggest that (stupid behaviour aside, like the cowboy circling a house with an excessive bank angle) most stalls are the result of
1) the aircraft being trimmed to a low speed, and the pilot becoming distracted, and the IAS decaying, or
2) the pilot flying say 10kt above Vs and then banking hard (e.g. a very hard base to final turn)
In neither case above is low speed flying going to help. One must do an immediate stall recovery.
In your example of a pilot trying to close a door, if the plane was trimmed anywhere near right, it would not have stalled hand-off. Like every plane, it would eventually have gone into a spiral dive, but that takes one back to flying the plane first and fixing open doors (or attending to distressed passengers, etc etc) separately - stall training is of no help if you are trying to close a door and forget to fly the plane.
Flying 10kt above Vs is perfectly safe so long as you are trimmed, are wings level, or bank below say 20 degrees. But one will be doing that in so few places (initial climb, or base/final) that in my view it would be better to teach the procedures (e.g. TRIM TO 80KT ON BASE LEG).
My question was not whether to do stall training, but whether to do so much of it. I must have done 3 hours of it myself. It was great fun but mostly irrelevant to normal aircraft operation.
Your examples of forced landings and lookout are not applicable.