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Substinence farming fucking sucks, you're going to be on the field all day long in the summer in order to have enough food to get you through the winter. Hobbyist gardening gives you best of both worlds - you have a nice patch of land to play in, and at the end you get a handful of produce to show off to friends and family.
Subsistence farming sucks for grains and similiar things that can be efficiently machinized.
For many fruits and vegetables farming still relies on a lot of manual labor, often done by immigrants and vulnerable people under terrible working conditions.
My parents grow most of their fruits and veggies for half a year on about 40 m2 which is a tenth of an acre.
So with very little land it is possible to replace a lot of your grocery bag with self grown produce.