I like accurate rifles as much as the next guy, but I'm pretty darn effective with a rifle that shoots an honest inch or maybe even a bit more than that.
I mean, if you're head shooting grouse at 100 yards, yeah, you need sub-moa. I don't hunt grouse with a big-game rifle much, and never at 100+ yards.
I hunt deer, elk, pronghorn, sheep, moose...that kind of thing.
So, if you're rifle can shoot MOA at 600 yards, that's a 6 inch group and there should be NO problem whacking an elk, deer, or even pronghorn at that distance. The trouble is, I don't believe most hunters shoot as well as their rifles, by a long shot (pun there). They can't hold their chit together when it comes to killing game. They don't try to get closer and only remember the one perfect day they shot that 6" group at 600 yards, think they can do the same on game, and then blow a leg off, shoot something in the guts/ass, etc.
I'm also not afraid to get within reasonable shooting range either and from experience know when I need to get closer. I don't forget about the less than stellar days I have at the range. I try to go to the range on days that are crap weather, windy, cold, snowing, raining. I usually shoot off my pack rather than a bench. Some of those days, I would not feel real confident past about 300 yards in a hunting situation. The wind in particular is a beast and I don't care how much I shoot in the wind, I don't always get it right.
I ain't as good as my rifles...neither are most other folks. Some just flat fall apart and can't hold it together on game. Ask the average guy to show you where the lungs, heart, liver, etc. are on a big-game animal...its no wonder they make "bad shots" if they're aiming where they "think" the vitals are.
All this toiling over having a rifle shoot sub-moa doesn't mean much. A hunter that understands shot placement, knows how to hunt, shoots a 1.5-2" rifle well in the field, is going to find a lot more success with a lot more regularity than a hunter that spends all their time trying to chase a 1/4" 100 yard group.
Seen it...