ok Jack, but they did capitalize on important design features as the bows I just posted demonstrate,,( short draws can be effecient)
probably some of the bows you are refering too were for ceremony,, not hunting,,
not all Nataves shot a pinch grip,,
some bows were strong,,
I use a wide variety of spine length and weight, and I can shoot close ,,,, ,or far,,,I know how each arrow shoots as I am sure they did,,
even a powerful bow,,, needs a sharp tip to kill a buffalo,,and a strong bow,, even our razor sharpe steel heads fail to penetrate from modern bows,,,
any one that hunts with a bow,,, knows that the animal can jump away from an arrow ,, even a very fast arrow,, so you need to get close,, to up your odds off success and not loose your arrow that took a weekk to make,, even when I shot a very heavy fast bow the deer at 10 yards can jump the arrow ,, thats why they needed to get close,,
bows in the museums show,, that some took time to get things right,, I am sure there was a wide range of talent as there is now,,
the bows Ishi made were very good examples ,, make a duplicate of one of his Sinew Yew bows,, and you will see the arrow fly,,
I think you diminish the basic design and its effeciency ,,, when you say all sorts of designs would work,,
if you have made many bows, you would know,, that is not correct,,
maybe the norm was 40ish,, but there are accounts of much more powerful bows,, documented in jim Hamms books, and others, and if you were going to shoot with a sinew string,, the design would need to be effecient to bring down deer and elk and bear,,, also very powerful to shoot through a buffalo and kill the one on the other side,,, obvously well designed bows and arrows,,
thanks you so much for you input,, if was fun thinking about your views,,