GMMAT do you have something against bending at the waist? jk
I follow what you are saying and can tell you I have practiced from almost every conceivable angle in my stand many of which were impossible to maintain "perfect"form duringand in those instances I simply anchored lined up my peep and sight ring(like usual)and rarely if ever did I notice more than an inch change in my POI (about 22 yards). And while I am surethat could growat longer distances the main point of the practice was to be prepared (inside 25 yards) for any shot I could take in a stand even if the situation was less than ideal. You coulddiscuss the theories all day long, do what works for you.
What difference does this thread make anyway, your longbow doesn't have a peep or pins anyway.