Comment by Nomentatus

This is certainly possible. But Jobs decision to impose a design requirement earlier (if that was so) might have been excellent given the data he had; when he got more data (or logic) from John, he made a better decision and knew that it would take a big shove to get everybody else to change direction on a dime. It generally does. The anger wasn't necessarily about the previous decision, all sorts of engineering decisions turn out to be "placeholders": it may have been about not being willing to alter course quickly enough, or just intended to ensure everyone knew the direction had changed.