Well, to address your ? James, I think it goes back to our Bowhunting Forefathers! The ones who fought for our bow only seasons!
At a time when we just had finished a great war, Depression, and a time for the nation to move into the new age. Alot of stuff to be thankful for!
The ole cliched phrase "going to a gunfight with a knife" comes to mind. They needed to show the effectiveness of our equipment, and I don't think "stone" age, was the best selling point.
Now jump to today, the primitive reannactors, techs, have proven thru time, that the stone point is effective. We know and see this every year, when folks use them within reason.
As for them being banned, they never were wrote in as to be used, until folks, in the last 20 or so years, have legislated for their use. The law is pretty gray in some states on broadheads!
I don't believe every Native in the past made perfect points. Nor did they all build perfect bows! Even today we all have different talents and have to share or trade our crafts in the tribe!