This is untrue for the meat packing industry today. One cow going into a modern slaughterhouse is more efficiently processed then even the most meticulous native American tribemember could ever have achieved.
Efficiency is all that matters if resource utilisation is your metric.
Right, but even your hypothetical tribe member is going to be many orders of magnitude more efficient than a billion dollar factory trying to grow a postage-stamp-sized piece of fake meat.
The ground they stand on has an opportunity cost. The feed, vet, and butcher all cost money. And it takes years to raise one. So all told, there is a cost, which is why the supermarket does not give away meat for free.
Efficiency is all that matters if resource utilisation is your metric.