I am a firm believer that you need a well-defined leadership role to deal with unexpected and non-linear side effects of people working together. You need someone to keep the threads untangled and forming a high-functioning web rather than a big snarl of a Gordian knot.
RandsWatch with awe and amazement at how quickly an engineer will become totally annoyed by inefficiency.
RandsGood design isn't about making decisions for your users, it's about making those decisions irrelevant.
Rands