>They really not needed in commercial agriculture either. Farmers know their craft and would do well without it, and wouldn’t have the additional finance burden.

This could not be further from the truth. Farmers do everything to increase their margins. If they could just stop spraying their crops they would.

>Farmers know their craft and would do well without it

Unfortunately knowledge of a problem doesn't make that problem disappear. They know their craft which is why they spray their crops.