I suppose he doesn't really have to prove anything to anyone. Not everyone wants to run a 10,000 or 50,000 employee company. Not everyone would be happy with the stress or bureaucracy involved.
Not to put too fine a point on it, but your attitude is exactly the kind of thing he's talking about in the linked interview. Mega growth and mega profits are one measure of success. A life with low stress and plenty of time for your family (and by the way, making all that possible for your employees, too) is another one.
I agree with what you. His style of running a business as likely maximized his personal happiness, and possibly his employees.
But I would have liked to see him say "we could have been far more profitable, but we didn't care about that, so we limited hours and didn't hire salespeople." Instead what I hear him saying is "we are the best business we could be, because we limit hours."
Not to put too fine a point on it, but your attitude is exactly the kind of thing he's talking about in the linked interview. Mega growth and mega profits are one measure of success. A life with low stress and plenty of time for your family (and by the way, making all that possible for your employees, too) is another one.