My favorite "why has no-one done this yet" for agricultural photovoltaics would tweak the compromise even further towards plants: space the panels not only nort

My favorite "why has no-one done this yet" for agricultural photovoltaics would tweak the compromise even further towards plants: space the panels not only north/South but also east/west and make them heliostats, like we used to do when panel price was still the limiting factor (heliostats need distance between them to not shade each other, these days it's cheaper to just pack panels tightly oriented for noon). If you put them high enough to run machines beneath you'd get zero permanently shaded area.