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You are correct. Paved roads are a breeze to bike on. However, the roads I use are unpaved, not paved. Have you been to the Siuslaw? There are no flat sections of more than a few miles. I guess I do the impossible by hauling gear on a bike on class 4 and 5 roads. Several times during the winter months (we get very little snow, but it can rain like a river) these roads are undrivable, but still bikable.
Other than size restrictions, I doubt there's anything you can bike that I can't drive through, though the flip-side can't be said. But then we are really changing the definition of driving, winching is not really driving.
By the way, although I am temporarily stuck in a suburban small city, I have generally grown the bulk of my family's food and even hauled excess into town (by bike, of course).
Again, it is so sad how physically soft our culture has become. What were once luxuries are now considered indispensable.
-- human power
Here's the problem, NOBODY IN THEIR RIGHT MIND WANTS TO LIVE LIKE THAT.
Growing most of your own food, even 90%, is a breeze compared to having to do 100%.
Once again, cavemen would think us soft. Who cares?
Sorry, but the 99% of the people less fit than you and I get to live their lives as well.
The difference is, I recognize that, you don't.