It might depend on leadership culture. Most people are unprepared for their first management position, and how can they prepare? You even see natural leaders flounder, when put in the same leadership position and culture. The positions are necessary for the organization, but I believe almost nobody has really cracked the nut generally, just for their little trible. Most impactful thing leaders can do is cooperate and bring teams together, in order to accomplish concrete goals and organization. Project Lead is sort of that, but it needs to be continuous instead of temporary and limited scope.