No, you're off the trot there. People are still gathering there because we still live in an agricultural society. I know everyone disagrees with this - information age (etc) but our lives still revolve around producing and consuming food. The test, of course, is to go without for a few days.

Have a look - ie Google - the stone watermill at Little Salkeld in Cumbria. Nick, there, is a particularly helpful individual (if he's still there) and it would be useful to run your theory past him. (He's been producing lovely flour for thirty years).

In a strange way I have sympathy with your view - I believe the potter's wheel was in use here long before it is accepted that it was - but there is little or no supporting evidence. What we have - querns and worn down teeth - suggests that milling grain was a kitchen enterprise. And I've done it - remember the old Corona mill? No wind power neede there, just a sturdy table and some elbow grease ...