Agribusiness will happily choose lower yields in exchange for improved mechanization. Or resistance to disease (higher risk thereof from aggressive monoculture). Or better shelf life/transportability. Or marketability (yellow tomatoes don’t sell as well).

The backyard gardener doesn’t quite have those worries and could get higher land efficiency.

Isn’t this a bit of a false dichotomy though - solving a (potential) world food shortage or not; being more efficient than industrial farming or not; feeding one’s self/family completely via gardening or not gardening at all?

It seems to me that the more people who supplement their food supply with goods that don’t depend on imported supply (home or community gardens) lessens demand fractionally on the general supply, which fractionally helps with local pricing and household budgets, both of which are positives.

I’m not sure it’s ever been a requirement of victory gardens to be completely autonomous unless ur a hardcore prepper.