I did it for 6 months. Only figured it out when someone outside my head finally used it. Here's what it looks like from the inside. You have a problem. A real one. You feel it daily. So you build something that solves it exactly the way you would want it solved. Every decision makes sense because you are simultaneously the builder and the ideal user. The product feels complete because it fits your brain perfectly. Then a stranger uses it. And you watch them get confused at the thing you th...