Agree very much with this article - this is probably <i>the</i> most common problem I see when founders try to pitch me their ideas and getting me involved.<p>They have some domain expertise, and they've let that convince them that they know <i>exactly</i> what needs to be built. They've slaved over designs, they've painstakingly considered all the angles they think matter, and they've been operating on pure hypotheticals for months on end.<p>The reality is that, should you prevail and be successful, your product will only loosely resemble what you're envisioning right now. I am frequently frustrated - even by experienced technologists - whose "MVPs" are the size of the moon, and they regard validation as being only applicable to details, not the core of their concept.<p>As someone once said, "no battle plan ever survives contact with the enemy".