Do humans need meat for essential amino acids?

Nutrition is a matter of absorbing the needed nutrients thru the intestine.
I think our stomach linings are designed for dissolving meat.
Essential amino acids from meat?
As compared to other sources.
In my experience--meat is better.
Invented forms of amino acids--lack the abundance that meat creates in the stomach.
Supplement forms of amino acid should be used w/meat.

You need 22 specific amino acids to build the proteins found in most parts of your body, including muscles, red blood cells and immune cells. Because your body can only produce 13 amino acids on its own, you need to get the other nine from your diet. These nine are considered essential because you need them to maintain a healthy body. They are histidine, lysine, threonine, methionine, isoleucine, leucine, valine, phenylalanine and tryptophan. Although you can get amino acids from both plant- and animal-based foods, only animal protein contains all nine essential amino acids.

Meat contains all 9 essential amino acids, in roughly the proportion you need. So meat is conveinient.

You can get everything you need from plant sources, though you'll need some variety to cover all the bases.

In short, meat is great for survival, because any animal you carve up should contain all you need to keep up your vital functions. When you are surrounded by very abundant veggies, you'd be better off sticking to a mostly (if not all) veggie diet. Just do some research regarding the pros and cons and specific amino content of the foods you plan to eat. For example: it isn't a good idea to dive into a "vegetarian diet" eating tofu by the fistfull, garden burgers on the weekends, and expecting to somehow be healthy.

The quality of soy protein is about identical to meat. Legumes are also high quality. Dairy products readily can be substituted for meat. Meat must be cooked or tenderized for humans to digest. Meat is not essential for humans and a vegetarian diet provides all the essential amino acids (otherwise as a life-long vegetarian, I'd be dead).