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Often, leaders provide excellent strategic planning even if they are not completely well versed with the business domain, by way of outlining high level plans, communicating well, building a good team culture, and so on.

However, trying to distinguish the exact manners in which the leader does so is difficult[1], and therefore the tendency is to look at the results and leave someone there if the results are good enough.

[1] If you disagree with this statement, and you can easily identify what makes a good leader, you could make a literal fortune by writing books and coaching CEOs on how to not get fired within a few years.