Very early in my career I used to believe that I or anyone else could be a CEO.
It wasn't until working with tiny teams where the CEO/founders devoted everything in their life to the business -- often at the expense of hobbies, romantic relationships, and any shred of free time -- that I realized true CEOs are a rare breed.
When are you ask things like "what happens if the product fails?" the answer would always be "It won't."
They both relentlessly believe in, and put every ounce of energy toward, their vision because anything less would not suffice
Again as trite as it sounds, I empathize with these people in that to them losing their vision felt like losing something dearest to them