> The error resulted in Apple restructuring its graphics processor team and moving some managers away from the project.

Not suggesting this is or isn’t it, but the manager thing cuts both ways. I’ve had managers who push overly ambitious goals, and managers who defer to the overly ambitious engineers because they seem confident enough and the manager has failed to understand the engineer’s capabilities.

I’ve experienced many engineers who are waaaaay too ambitious and really do not comfortably understand the true development cost to everything. They deliver the first 80% on time and the second 80% puts the project six months behind.