Techie founders generally operate in their comfort zones: they like to write code. They often start developing software before they validate with customers. As such, they often build solutions looking for problems. Do NOT write code before you immerse yourself in customers and develop a deep understanding of what pain you are solving.
Bootstrapping a startup to early revenues by providing services is a tried and true methodology that we practice and espouse in 1Mby1M. Why is this set of skills so important? Raising funding for startups in Silicon Valley is a low-probability game. Fewer than 1% who try actually succeed.