Partial shade crops include broccoli, asparagus, kale, carrots, brussels sprouts, peas…basically all the healthy stuff. Adding a whole second revenue stream to their production would make them more competitive with the unhealthy stuff (corn, rice, wheat).
Corn is an absolute miracle. It probably took hundreds of years for native Americans to cultivate and domesticate corn to the nutrient crop we know. Those three crops feed humanity. They shouldn’t be shunned for what modern food processing practices. The US alone produces enough corn to feed well over 2 billion people per year.
Sure, but it’s just imbalanced in people’s diets, partially because of the cost differential.
It's also pretty common to use solar fields for pasturing, especially where the slopes are too steep for heavy machinery.