BDM,
You are absolutely right - one does not NEED a foregrip to use the proper "fighting stance". Fore-grip - magazine, mag well, they are work. Just use what works best for YOU.
You also bring up an EXTREMELY valid point - TRANSITIONS (from one shoulder to the other) are MUCH easier with a foregrip 'stance' than without. (Foregrip stance meaning the use of a 'foregrip' or magazine or magazine well.)
RATFINK,
That is definitely a decent by-product (not exposing your 'weak' spot) - but to the best of my knowledge - that was not one of the driving forces. The biggest driving force was movement.
cheers
tire iron