Aside from drawing more deer to your fields, food plots provide habitat and nutrition to a wide variety of animals, and the whole system benefits.
Hunters shouldn’t try to compete with farmers. You are not trying to grow crops in perfect rows in a large field. You are looking to bring in a buck you want to shoot in daylight. This means creating one or more food plots that bucks feel comfortable feeding in or cruising into as they search for does during the rut, during daylight.