I don’t have the military training that others here have but for the kinds of reasons that Malgus gives I have always thought isolated homesteads are not the answer. You have to go outside sooner or later and a patient attacker can just be there waiting for you. Where I used to live was attacked multiple times during colonial days and it was always the isolated farms that were hit first. It got to the point during one period during the French & Indian Wars that people who lived outside of the palisade would come inside for the night, bunking in with family and friends. There is safety in numbers. It will take villages and small towns working together to fend off those who would take what they have.