On the issue of a central leader figure, I have seen projects fail precisely because someone was staking a career on it. In that scenario, the customers you truly serve are your boss and your boss's boss. Users? Damn them and their expensive 'requirements'. Support? Someone else's problem. Maintainability? How is that going to get me promoted? All of those things cost time and money, and therefore are risks to be avoided. Better to spend your time burying bad news and selling your failure as 'success' to those who really matter.
All of the self-managing teams I've ever worked on have been much more user-focused and success-oriented (in the true sense) than any project where someone was afraid of losing their head. Self-managing teams just seem to be immune to certain kinds of office politics.