alt Hacker NewsNo, for the same reason I don't try to manufacture my own car in my backyard or build my own house, or grow all of my own food, or ...
This is basic fucking common sense: I'm good at some things and other people are good at other things. We each specialize in the things we're best at, and everyone ends up better off.
You went to the extreme though. I didn't ask if one wants to do everything themselves. In the US, for example, there are still hundreds of millions of people to specialize in various roles.