Capable people need meaty challenges. There are no meaty challenges in the very beginning except defining what it is exactly (or approximately) you’re doing. That’s a job you can’t divide up too finely. And the communication costs of keeping everyone in sync with the daily changes is daunting.
Getting something out the door was key also because it clarified our vision and focus more. We were making fewer guesses—not because of explicit user feedback and data analysis as much as just observing and experiencing real-world usage. As Matt Mullenweg put it, Usage is like oxygen for ideas.