Well, then the technical co-founder will spend tons of time doing things such as setting up emails, scanning viruses, looking for intruders to servers, setting

Well, then the technical co-founder will spend tons of time doing things such as setting up emails, scanning viruses, looking for intruders to servers, setting up quickbooks. Then you lose man-hours that should be dedicated to your main product/services. I know this because I have been working for 6 startups for 10 years. This is a very common pattern that leads to failure.