I would be interested in examples of people (besides Carmack) who are able to handle day to day management responsibilities and stay technically sharp in new technologies coming out. There's only so much time in a week, and your performance drops as you exceed 40-50 hrs/week.

I'd rather hire someone with management skill who knows how to delegate to those who have the required technical skills, rather than spin constantly trying to be the master of everything and failing at it.