I think a typical person would be receptive to some of the PU techniques but not others

I think you might have a mistaken view on what a PU technique is, and does. A discussion would make more sense if you were specific about what you think works or does not work. It is not a clearly defined field anyway. The comparison with magic also does not hold that well. In magic you have spells, and it is clear when you cast a spell, and when not. Your PU toolbox consists of wider variety of issues.