If you are going to hunt with a bow, why in the world would you worry at all where the fieldpoints hit?
It only matters, to me, for reference. If I know my bow's tuned for my FP's......it ought to be tuned for my BH's. Since I shoot one bow for both.....it's simply "a" point of reference that one would not have if all they shot were BH's.
Your advice is correct, though. If you truly tune your bow to (_______) head/point.....you're golden.