Protein?
Cows do a pretty good job of this [edit - for us].
Its kind of funny to say that because Elephants can get all their protein from grass so can humans (unaided by outsourcing to cow) because there are differences in physiology and lifestyle that are more than significant.
The day humans start eating raw fresh or rotten meat and find enjoyment in that is the day I will accept that humans are meant to eat other animals.
Also, if you are downvoting me thinking that I am some vegan activist, you are wrong. I am from Asia where relying on fruits and vegetables is or at least was till a few decades ago quite natural.
There are people who advocate, and claim to enjoy, both those things.
This guy: https://www.youtube.com/watch?v=xxvszzgYRjU who claimed he learned it from a tribe.
Maybe. But to suggest that we could all get along fine by just eating grass all day is ridiculous.
Also, cooking and refrigeration aren't necessary to prepare and preserve meat. Ancient people would make pemmican which will keep for months.
Sushi. Shrimp. Spanish ham and other cold meats like chorizo. Steak tartare. Jerky. Many fermented meats that I don't know the name of. My brother even loves eating raw meatballs.
We cook, not because we aren't meant to eat meat, but for the better taste and easier digestion.
I personally hate raw vegetables, they're too crunchy and taste like... cardboard (personal preference of course). Cooking is not a phenomenon exclusive to meat.
Whenever I read this kind of thing it makes me sad that people don't realise that actual fresh veg of the kind that you don't buy in the store is actually delicious.
Raw vegetables are just not my cup of tea.
Cooking is inferior. You cannot better nature. It just is not possible.
King Tut died of an infected broken leg.