That may well be the case, simultaneously implying that an average hunter doesn't practise anywhere near enough to be even somewhat proficient with his rifle. If they did, a stringing problem would become obvious rather quickly. One way around is to sight it in cold, one shot ever half an hour or so, and trust that you'll never need precise follow-up shots. Or participate in an european style hog, fallow deer and red buck hunt, where you'll easily take 15-30 game shots an hour, sometimes in matter of minutes. My personal "record" is exhausting an ammo reserve of 60 rounds of .375H&H in one afternoon.
I try to put at least 50-100 rounds through each of the rifles I'm planning to use each season, on top of the regular annual practise of up to a dozen bricks of .22 and maybe a thousand centerfire rifle rounds, but then again, I consider myself a recreational shooter, too.