> The big reason is growing food in wide open fields is almost always more economical. Urban farming is mostly advocated for by people who spend too much time in urban areas and don't have a solid grasp on the scale of the rest of the world.
While I agree on your conclusion, your reasoning is not entirely correct; urban farming is a byproduct, at east in MI, of a broken food chain wherein people left in the wake of financial disaster (2008) were left to fend for themselves and had to 'return to the land' while still being forced to stay close-by in order to just survive. Detroit was a food desert, the local, state and Federal government did nothing and corporate interests di-vested mainly from any real healthy options or grocery stores, what was left was what plagues the modern American diet (highly processed junk) and when the people of Detroit realized the help was never coming they took it upon themselves to create what has become the largest urban farming operation in the US.
Again, your conclusion may be correct, these people could not leave Detroit mainly for ecnomic reasons and were therefore 'Urbanites,' but rest assure this was not a hobby-farm approach they took, but rather the sullen and resentful resignation that they must feed themselves: what has since occurred has been amazing to watch, many chefs and artists returned back to Detroit and have made it an impact in self-organization and food security circles.
If I had more time I'd also make an argument for why the economies of scale tend to favor open field farming, but isn't that much better due to the vast needs of Govt. subsidies and the ever diminishing returns on investment when it comes to farming, conventional or organic, or in my case when I farmed: biodynamic.
You need only look to US/European farmers following the path of their Indian counterparts in mass suicides due to the unrelenting pressures and high debt loads in order to feed the masses.
Personally speaking, I think a huge missed opportunity was lost when many of the disillusioned in both West/East took to lying flat or quiet quitting etc... what should have been done was incentivize these people with low no interest loans and give them swaths of land to find purpose in regenerative Agriculture in order to remediate the soils and help offset climate control. Instead they just got chopped up in the meat grinder that is the depressing work force where they wallow in depression and suicidal ideation benefiting no one and making society more precarious day by day by making them gravitate towards extremism.