Meat is the best food on earth, the most nutrients out of all foods in the bioavailable form especially when you count organs, it is not high calorie unless you eat pork belly, and if you eat meat raw you will get enough nutrients out of it and don't need to eat more
Yes protein, no fibre, no human on earth needs to consume fibre, fibre is actually bad for us
Yes no human on earth likes eating leaves and plants, no wild human ever encountered these anyway because they were recently cultivated meaning that modern plants were outside our natural diet, even so, wild humans would never look at leaves or flowers (vegetables) and have an desire to consume it, and if they did raw it would taste bitter (toxic)