Crop variety was decreased by the original farming revolution, about 10k years before the industrial revolution. Rather than eating whatever was available, the large majority of the caloric input of an agricultural society comes from a few staple crops optimized for overwinter storability and producing large yields and thus supporting a large number of people.

The industrial revolution didn’t qualitatively change farming. It just made it possible to have more of it thanks to machine labor. The same goes for the later agricultural revolutions.