IO-540
I feel that you are missing the point a bit: The whole point is to teach delicacy of handling, technique and to instill confidence in the student.
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.
Take for example a stall spin accident where a chap was circling a friends house and pulling ever harder as the speed decayed/ AoA increased etc... would the outcome have been any different had the stick force been less?
Similarly a recent report included a stall/wing drop whilst the pilot struggled to close the door...
How often do you fly within 10 kts of the stall? Every flight I'd suggest - at take off and during landing. I'm fairly sure that an absolute terror of stalling is at least partially behind many landing accidents i.e. excess speed on final and/or snapping the nosewheel off.
Why bother being taught how to force land? Engine failures are rare so why not just accept a certain rate of fatalities!?
Why bother being taught a lookout since the aircraft you collide with is likely to be the one you don't see!?
Part of the fun of flying is developing a discipline - stall avoidance and aircraft control are components of that.