Assuming there is a market for the product, having a tech cofounder is needed because there will always be a competitor with a sharp tech cofounder that will out do you.
I think it depends on what your edge is. If your edge is your technology then you need the best developers, if your edge is marketing then you need the best marketers, if your edge is fund-raising…
Having said this anyone starting a technology company without having a founder with a technology background is insane.