I did boil that spinach, it was a large bowl still and way more than one person could eat. Also, the body doesn’t digest veg like you believe. We use intestinal flora to breakdown the cell walls and access the nutrients within, this is certainly not 100%, not even close. Have a read of this article, it’s about a women who blended lots of spinach and other greens and had acute kidney failure because of all of the oxalates.
Meat sits in acid, it doesn’t take lots of energy and is incredibly bioavailable. There is a whole lot of nonsense people believe about meat. You need to reassess some of your beliefs.