I rotate my staple crops for two reasons.
One is because of the soil structure. Harvesting potatoes is almost as damaging to the soil structure as digging it so I think rotating this soil disrupting crop is a good idea.
The other reason is for weed supression. On my big beds I grow squash, onions, beans for drying, potatoes, and garlic in that order(these crops are intercropped with other things but I won’t go into that).
The squash and the potatoes smother the soil for a full summer growing season and need minimal weeding. The onions, garlic and beans however, let light to the surface of the bed. So the potatoes and squash are split up, time wise, by the weedier crops to help control weeds.
Nick