I think growing food is the wrong analogy, and cooking is better.

Growing food is more like designing and manufacturing servers.

Cooking is more like taking these goods and putting them to use.

There are plenty of places that host their own servers, including people that have these servers in their home or office. But far fewer produce these machines.

You could also say that cooking food is dumb. What's wrong with having professionals chefs do it? But that also doesn't take into account the added costs which makes it unfeasible for most.