I am still not sure what your point is?

We have to eat something and a vegan diet is one where we minimize land use by directly consuming the “raw” materials instead of a middle-men that introduce a significant amount of energy loss.

It is definitely necessary to improve the way modern agriculture works. Large monocultures do not provide a healthy ecosystem and we should work on creating a diverse and vibrant ecosystem. I really liked the movie The Biggest Little Farm that showed an alternative (despite them endorsing omnivore diets).