Cows right now isn’t even grass, they’re fed mostly grown crops. The trophic energy loss at each stage is generically 10% , so plants to cow to human you lose 90% of the energy each time. So for eating meat you only get 1% of that energy from the sun. If you ate wolves who ate cows it would be .1%.
For energy this will, once it’s at scale, be able to be more energy efficient pretty easily. Because for one cow you have to have the entire life of the parent animal then wait 2 years for the animal to grow up. It has to eat and move around and waste energy that entire time. Less than half of that animal has the desired final product, so you waste more there. So the idea is that with growing this you just start with some cells and then increase their size until you get enough and then package that.
Human relationships can be deeper but they’re harder to conceptualize for a random viewer. Animal relationships are simpler and purer and it’s easier to fully grok for a viewer.