Yield for some crops is actually more after the ~3 year transition period. However, for all crops quality is greatly improved. Better quality means you need to eat less to be satiated.
I'm envious of Japan's 'designer produce' tied to their gift culture. America doesn't really have much "This fruit is so much better, people are willing to pay 10x+ for it". I think our food system would be much better if we had $20 versions of all produce to get people to stop treating produce as fungible commodities.
They might not be farming at a scale big ag run at, but it’s no small operation.
The below link says “The midpoint acreage for U.S. cropland nearly doubled between 1982 and 2007, from 589 acres to 1,105.”
https://www.ers.usda.gov/webdocs/publications/45108/39359_er...