I have no idea where you got the idea that I want people to be burned like charcoal. I'm absolutely not in favor of that. Work hours are the least important factor in why I wouldn't hire the theoretical employee you described. It's the lack of ambition- the lack of enthusiasm towards the field.

In a startup you can't have unambitious employees- regardless of how talented they are. You have to have people who challenge the way things are done or the company will grow stagnant and won't seize opportunities to pivot.

I think people should care. If you spend half of your waking life at work, you should be proud of what you do and the people you work with. Pride in your work is one of the single largest contributors to happiness (more so than family, but that is largely tangential to the point).

Quite frankly I don't think that most of the people left at Yahoo care. If they cared, or had ambition, or had enthusiasm towards the web, they would leave.