Part of the mythology surrounding startups is about individuals creating multimillion-dollar businesses in their home garage, with very limited means. That story has permeated the collective subconscious, along with many others related to technology and business.
When you work in technology you are always bombarded by two things: bad advice, and magical thinking. Bad advice from professionals who recommend “content marketing” for everything and everyone. Magical thinking from other consultants, from investors, and from the industry in general. A bubble in which everything is fantastic, you get rich in a garage and nobody fails; you just “pivot”.
Reality is that for most projects it’s better to develop a very specific and simple concept, and scale from there to more abstract and ambitious functionalities. Kind of a bottom-up approach.
But 99% most startups follow the opposite path: start with an academic business idea: “the great vision” to conquer the world (they need to make their VC investors happy). And from there, going down to the specific. It is the top-down approach, that uses to lead horribly complex scenarios around software development, and also marketing.
This is the main reason for the Lean Startup Methodology. You need it to navigate a multidimensional ocean of complexity without getting completely crazy.