Wouldn't most of the world, and most of the beef in history, have been "grass fed"?
How about American Bison and the Plains Indians, that was all grass fed. Must be something to it..., then again there is always dry aging..
There is a huge difference in the taste between grass fed and cattle from feed lots. Most beef consumed in the U.S. comes from feed lots. Very few cattle from the sale barn go straight to the butcher.
If the folks in the U.S. were forced to eat grass feed beef, there would be a revolt.
There is a vast difference between meat from cows and buffalo. All you have to do is cut a filet from each and you can see the difference and taste the difference.
When we did butcher, we took all the meat and had it ground-up or made into cutlets. Ground up is the only way to go for grass fed beef.
Steaks are not edible and the fat is not something you want to eat.
Crime does not pay, neither does ranching.