[Gimpei]

Somebody has to manage the business relationships and go out and sell. Somebody has to be in charge of marketing, payroll, and PR. Somebody has to be the public face of the company, out networking and attending trade shows. If you’re a technical founder and all this sounds like fun to you, then yeah, a non-technical cofounder would not offer much. But there’s something to be said for having more time to put your head down and build.

[edg5000]

Well said. If the company is built around a certain specialism, the specialist will want to spend most of your time there, because that is where most value is created per hour. But many of the other things are critical, but happen to be very time-consuming. Such as traveling around. So in some teams you end up having one person do this specialist work while the other can focus on the more time-consuming things. I think you worded it much more elegantly, I'm just repeating what you said.