First of all, a shot can go bad even if it is well within one's effective range, clear, standing still etc. However, the odds of that happening increase dramatically, to the point of a miss or worse and should be expected when one shoots too far, running, brush, alert, etc.
I disagree that "no one complained" years ago when the "experts" took long shots, running, etc. I was 16 when I first bowhunted. (1970). I didn't know much (still don't). I hadn't even see a live deer yet. My ethic at that point had been developed while squirrel hunting. However, one of the men in camp came in every day and talked about 'emptying his quiver' at deer across a gulley (he figured 90 yards). He claimed 'nothing dies if nothing flys), I knew that was wrong.
As much as I respect Mr. Bear when I read his book and learned of some of his shot attempts (the stone sheep at partial draw over the rise comes to mind)I also knew that wasn't right.
I have a theory about folks who take low percentage shots. I don't think they follow up misses or poor hits with much time.