tl;dr:There are times when leader must head-off mistakes. Here are a few examples: (1) Starting a project that likely won’t ship, or won’t benefit the company. (2) Believing a pet project will get them outsized recognition. (3) Making a decision that will commit the company to something that isn’t a good long-term fit. (4) Over-emphasizing long-term or abstract benefits to the detriment of shipping. (5) Diving in too quickly to make changes to a system, resulting in unforeseen or unpleasant consequences for other teams.