As someone that grew up on a farm, can you explain why? And also explain why the practices, aka fallow fields, are incorrect? A lot of the subidies and practices we have in place today are direct results of things like the dust bowl.
> Surely there are better, healthier ways to grow food that are still economically viable.
Have you validated such assumptions? I can guarantee that large scale farming is a lot more nuanced than one can assume in an arm chair style.
Until you've seen what pests can do to a field that hasn't been treated with fertilizer or say herbicide, its really hard to understand why they get used. It is the difference between having a crop to sell, and going out of business and selling off your farm.
This black and white thinking that comes from people that haven't any experience in the chosen field is honestly more annoying. Should we improve? Sure, no farmer would disagree, but would you be ok with increasing your food costs by 5x? 10x? even more? These are the things you ultimately have to consider when you knock modern practices.
There is no free lunch (pun intended) if you ban modern practices. There is a good chance that requiring the things you want makes large scale farming impossible, and results in more people without food at all. I'm not sure that is an overall net positive.