Nor technical writers. Professional products come with professional user interfaces, have withstood extensive testing, come with high-quality documentation, and ship approximately on time. Good coding is a necessary ingredient, but by itself is not sufficient to ship a truly professional product. A common belief is that everything happens quickly and somewhat simultaneously, and that planning occurs along the way. Unless you have a solid agreement before starting, getting funding inevitably takes longer than anticipated.
Planning tends to be ad hoc and considered only as it becomes needed.
Uncertainty frequently exists as to whom various responsibilities belong in the growing team. Build Team shifts to near the end and the Ramp Up time is eliminated. The whole proverbial enchilada. Using a venture software team to do the initial development lets the Build Team stage move to very late in the development process. It can even occur after the initial version of the product ships to allow early sales revenue to fund the salaries of new employees.