Good weather and smart farmers ..

I live in a productive rural district with high exports; dumb people and million dollar machines don't produce anything of note.

People that know the ground, know the past variations, know their seed stock, etc. produce good returns over decadal periods, as yet machiness and AI alone don't match that.

Now, give it a few years...

I hope you're not suggesting that farming is easy and that you just need the right machines. Otherwise, your argument is that a 15th-century peasant possesses all the necessary skills, education, and training to operate a modern farm, and they just need the right equipment.