Ever since I saw that video of the Tesla Roadster, I can’t stop thinking about it. Not how cool it is, not how innovative or how interesting it is, but how stupid it is, and also just how stupid many products feel these days. I grew up with Back to the Future and Star Wars. The idea of a flying car is intrinsically futuristic and cool to me. There’s no debate worth having about that. But the problem is how it works in reality. In my mind, it was never a technical issue as much as a safety issue. In...