The problem with megafarms is that they are not sustainable long-term. Such intensive agriculture pulls nutrients from the soil faster than they can be replenished - year after year after year. So farmers have to supplement more and more with chemical fertilizers, and the soil effectively becomes little more than a hydroponic medium. Potassium and phosphorous reserves are a finite resource to be mined.

https://news.berkeley.edu/2015/05/07/soil-depletion-human-se...

The US needs more farmers and people living choosing a sustainable simple life, not smart tractors.