I think people historically ate organ meats out of necessity in times of severe want.
Oh yeah. When you don’t know when you’re gonna get food again eat every little bit. But we know when we’re gonna get food again. Don’t need those nasty bits.
While I hate liver, I understand it’s value.
People ate organ meats because pound for pound they are much more nuritious than muscle meat.
Organ meats and fat (bone marrow!) can supply nearly all your nutritional needs. All the best fed humans throughout time were eating that way.