Founders do not have a guidebook or manual to follow the way that later generations do. They have been thrown into a completely new situation.
Most people will never work or be part of a startup so they simply don't have the skillset to comprehend - or even imagine - how to make things work. Way too many of the people I meet these days think of a startup as either some glamorous venture that'll take off overnight or just a hobby to keep you distracted from how unfulfilling things are at your day job. But a startup is a lot more than that.