This is what I realised when I was on a Permaculture course, which is why I decided to work in other things like carpentry, bike maintenance, and Storytelling; areas which are helpful to other people who can grow food much better than me, and which can work in a simpler and more localised economy.
Food wise we're probs 65% self sufficient, from what is produced here.
Another 10% of it is barter for other people s produce, game etc
And I pay myself, the mortgage electric council tax etc from produce of this land.
But I still need other people, and their skills for things I can't, or haven't got time to do..
I'm not really a fan of this unrealistic idea of 'running away to the country' to some kind of 'Good Life' idyll..
In many ways towns and cities are better ways to live as you've realised, if they could be designed better, to be nicerer for humans, with more food growing going on, in or near them.
A lot of permaculture is (in my slightly cynical view) old indigenous wisdom, methodologies, and common sense resource efficiency, repackaged and sold back to the disconnected .
Not harmful as such , but it does often seem to be a white dude in a plaid shirt spouting stuff that his more underresourced granny would have done as a matter of course..
Of course I love permaculturalists really.
.. Just couldn't eat a whole one, nor swallow the herb spiral..