I entirely agree with you, with one caveat: I have met one, maybe two persons in my life who were able to work and be intellectually productive 12 hours a day o

I entirely agree with you, with one caveat: I have met one, maybe two persons in my life who were able to work and be intellectually productive 12 hours a day on a prolonged basis, but they are the absolute exception. Building an entire company on the assumption that they are the norm is insane.