One of the training issues might be that it is largely impractical (and expensive) to demonstrate the feel of lack of acceleration in an actual airplane and while sims are wonderful these days it is not quite the "all enveloping" sensation. It is also possible that practical training for these events might cause more accidents than they save.
Back in the stone ages when I learned to fly spin training was, IIRC, mandatory. Eventually it was discontinued, as I understand it, because losses training were higher than losses from general flying and aircraft were being built more spin resistant. (I learned on a Colt, they were getting there!)
As a fairly frequent passenger I believe the "lack of airmanship" and "air sense" thing is a very real concern.