The side effect is they're also crazy in other ways (Musk-time and the billionaire-playboy-cyrptocoin-gambler being easy examples), but I think it really does take someone who operates with a totally different set of constraints on the world to pull Really Cool Stuff off. Like reusable rockets. Or electric performance cars. Or an incredibly versatile computer that fits in your pocket (while also giving the middle finger to Flash, the incumbent web media tech at the time).