True. And once their product hits the market, if it ever gets there, they don't thrive.
Prior to launch they are sooooo in love with their idea that they are meticulous about features all the while thinking they're smarter than the market.
They don't understand and appreciate the value of execution. Ideas are easy. Execution - because it involves people as well as adapting to change - is 10x harder.
Yes, those people exist. Unfortunately, that bias will ultimately undermine them, but they'll never admit it.