Having lived both ways, with grandparents who operated a dairy farm, we still have someone butcher the hog for us. But the premise behind your reasoning is mostly sound.
Some jobs/tasks are either done yourself, or the community will cooperate. My uncle runs multiple trap fields for the High School Trap teams. One of his neighbors brought over a machine designed to bury the electrical supply cables. Some state statutes require an electrician to do some electrical home repairs, but there have been a number of times I've heard my uncles referring to the work they do on their own implements, buildings and so on as "Farmer Fixes".