This is one of the reasons that doing a hardware startup is particularly challenging. Once you start, and have converted your idea into something physical, it’s very hard to change direction. — In 1997, when Netflix was just starting, our first warehouse was an old walk-in safe that happened to come with our first office in Scotts Valley. With less than a thousand DVD titles available, and a busy day consisting of twenty to thirty shipments, it wasn’t too hard to stay…