I believe our Paleo ancestors ate what they could get hold of. Animals, birds, fish, eggs, crabs, lobsters, clams, oysters, whelks, mussels, cockles, insects, plants, and fruit & nuts in season. Our bodies adapted to having a wide variety of different foods and now we need a lot of different nutrients, vitamins and minerals to be healthy. I believe one of the keys is variety of foods. No, most of our ancestors did not eat bell peppers or chickens. But, those living in the areas where bell peppers and chickens were available did. There is evidence to show that Grok preferred meat if he could get it because it gave more goodness bang for his effort buck.
The way I see it, I want to eat foods as close as is possible (and convenient for me) to what our pre farming ancestors ate. Did they have black pudding? Nah. Did they consume blood from the animals they killed? I'll bet they did.
Why use a sledge hammer to crack a nut when a steam roller is even more effective, and, is fun to drive.