That's also one of the reasons why I personally tune my equipment to the degree I do.
I believe a perfectly tuned arrow is going to be more forgiving of minor form descrepencies than an arrow way out of tune.
I practice with a bareshaft under different situations such as a reverse cant, shooting from the knee, shooting with the bow straight up and down, etc. etc. to practice maintaining my form in regards to shoulder and arm alignment under those conditions.
Yes...some people may believe that guys like me are being anal about it...and that's OK. I personally don't have any problem with any archer who doesn't take tuning to the level I do. It's just a preference thing.
I just personally feel more confident in my equipment when I set it up to shoot it at the best of my ability under the conditions I will be shooting it in. Confidence in your self and your equipment plays a huge roll in our accuracy. Do whatever makes you feel confident.
Like I said...as long as your equipment is at least somewhat tuned...most bowhunters will do just fine.
Ray