I’m surprised that it’s only a factor of ~300 between the modern, highly mechanized grain farm and 200 years ago (before the engine, before modern fertilizers, and before electrically pumped irrigation).
A megacorp running a million acres would be a lot more efficient than a 1000 families running 1000 acre farms but, for various reasons, the system is biased towards the latter.
These Silicon Valley tycoons are trying to “disrupt” agriculture but they aren’t going around telling anyone what they’re up to, just buying up a bunch of land and hoping nobody notices. The political winds will not favor their usual shenanigans.