Well I am growing at least 5 varieties of tomatoes, the same number of chillies/peppers (all in the polytunnel, quite tightly packed in), two varieties of kale plus PSB in the same bed, and my rotation of beds just doesn't work if I need to leave plants in individual beds.
It all depends what your priorities in smallholding are - we try to be as self-sufficient as possible and manage pretty well with veg (not all - no point growing main crop tatties, onions and carrots), quite a bit of fruit, diary (except butter) and all meat.
I am afraid life is just too short to do everything...