You are conflating the terms "possible" and "practical" :-) There are communication technologies today that have made this more practical. 10 Gigabit microwave

You are conflating the terms "possible" and "practical" :-) There are communication technologies today that have made this more practical. 10 Gigabit microwave links are a thing these days. That said, there are a lot of variables. Community gardens, barter systems, and others which once you open up the problem to the question "can a community be self sufficient" you get into village design. [1] https://www.cablefree.net/cablefree-millimeter-wave-mmw/10g/ https://www.cablefree.net/cablefree-millimeter-wave-mmw/10g/