A focus on a single topic/category/skillset. The Ford dealership has a bunch of mechanics who specialize in Ford vehicles, but I find that my preferred mechanic

A focus on a single topic/category/skillset. The Ford dealership has a bunch of mechanics who specialize in Ford vehicles, but I find that my preferred mechanic does a better job. (In this case better job means: fixes it the first time, with no new problems after, and the work doesn't feel sloppy unlike the warranty repair I had to have done by the dealer. In the later case they just reattached 2 panels wrong, something a specialist should be able to do without problems)