Farmland is stupidly expensive. The equipment and inputs (fertilizer, fuel) are stupidly expensive. Growing outside, you are forever at the whims of the weather rather than being able to control each detail of production. Fields inevitably have parts that have variable soil and water conditions. When you look at what a country like the Netherlands has done with greenhouse growing, it's pretty compelling. Was AppHarvest the answer? Apparently not, but that doesn't negate that there are indoor models that work.