That being said, I don't subscribe to Arthur's ban on 400 gr or less arrows. That just seems to be putting the responsibility in the wrong place. It is the hunter who needs to decide which arrow weight works best for their setup.
State game departments regulate practically all aspects of weapon use. Why do they do this? Because there are thousands of people out there who don't have a clue that cetain configurations of weapons are not totally reliable for taking game.
I'd be willing to bet that not 1 in 10 bowhunters would know that a 600 grain arrow has a much greater penetration potential than a 300 grain arrow. Many would think the faster arrow would penetrate further.
In fact, the average bowhunter doesn't spine tune their arrows, they don't purposely shoot high FOC arrows with their fixed blade broadheads. Almost none tune the dynamic spine of the arrows to the setup they're shooting. I've watched many dozens purchase arrows at bow shops and I never hear anyone ask anything other than "how fast will these shoot?".
Leave up to the hunter? Kind of like letting them decide when deer season opens and closes.