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Leadership expertise knows where the line is between being a leader and being a doormat.

I don't think there is anything like expertise when it comes to leadership
Leadership is not some sort of professional discipline L👅L

A leader who is not soft is simply a dictator, being soft as a leader shows your followers how to follow as every leader is also a pacesetter. But it calls for wisdom so that of the followers will not take an undue advantage of a leader just because he is soft.

Well a true leader must be diplomatic and tactful