The reason I say "good enough" and "doesn't really matter" is because of exactly what you pointed out. 90% of hunters are not capable of telling the difference between a 1MOA gun and a .75MOA gun because they are adding .75MOA of variance into the system themselves. So, in that instance you can shoot one group that is .5MOA because that is what your gun is capable of and you have a great 5 minutes of shooting, but in reality, the average that the gun is going to give you is 1.25MOA because of you. A .2 MOA difference is going to be noticeable to most shooters.
Even if you are good enough to be one of those shooters who can tell the difference, you better get in line for one of the proven smiths, because if you are using Billy Bob Down the Street, you are probably getting a prefit from one of the bigger barrel makers.