Okay, I’m going to cite a cartoon distributed by one of my favorite law school professors. Two men, apparently members of the French Foreign Legion, are standing in the desert. One is dragging a sword point through the sand and says to the other as he passes: “You have to draw the line somewhere.” The arbitrariness is the whole point (no pun intended.)
A helicopter is a very noisy intrusion on the top of a mountain that facilitates easier access to game than that provided by riding a horse, walking, skiing, snowshoeing, and yes, even riding a seat on a bush plane. It’s too easy and too intrusive for my taste.
YTMV, and there’s little or nothing that anyone can cite that will make it anything other than a matter of personal choice, other than the potential adverse effects on animals.