Also, those are sins of the past.
I'm not sure I follow. Monocropping is still the dominant mode of agriculture today. With it comes a whole slew of issues, only briefly touched on by the OP. Consider the economic impact of literally designing crops so that they're more easily farmed by machinery. The goal was to eliminate manpower to make the
accumulation of crops more profitable. The key issue being accumulation and the market economy. Before the nineteenth century accumulation was done in order to redistribute and provide provisions communally under poor crop seasons. Consider as well that monocropping makes it far more likely to experience crop failures, due to a lack of variety in the yields. If a monocrop fails, the entire crop fails. If a species of insects attacks and prefers a particular plant, it has an entire field of it to feast upon. This leads to the creation of chemicals to combat problems because what might have once destroyed a portion of the yields (since a variety of specimens were planted) now destroys everything. Just like antibiotics, these combat techniques create superbugs by killing off the weak ones, while the resistant ones survive to breed. Modern agriculture i constantly chasing demons. So now we have genetic engineering, in order to alter the crops to make them even more resistant to problems because the chemicals of the past started failing.
These aren't sins of the past. They're current issues. They're also intricately tied with the economic organization of society. There's a free-market mentality around farming, despite agriculture being the fundamental social organ of subsistence. That we allow a so-called "self-regulating" free market to dictate our survival is an abomination to humanity. Crops should never have been treated as a commodity. Subsistence should be publicly-owned and controlled. Mass agriculture should have never been allowed to be private property, save for householding. The Great Enclosure and the parcelling off of property into private hands that preceded the Industrial Revolution was the biggest disaster humanity has ever faced.