The same logic could apply to literally any service. Restaurants? Why not grow/hunt and cook yourself? Translator? Why not just learn another language? Taxi? Why not buy and drive your own car?
For most of these things, the answer should be so obvious that it needn't be said, but apparently that's not the case. Division of labor and specialization generally has at least one of the following advantages over doing it all yourself: cheaper, faster, more reliable, more competent (i.e. better quality), and less stressful.
For most of these things, the answer should be so obvious that it needn't be said, but apparently that's not the case. Division of labor and specialization generally has at least one of the following advantages over doing it all yourself: cheaper, faster, more reliable, more competent (i.e. better quality), and less stressful.