Trying to answer the actual question. I have seen leaders/managers any style. You do not have to be big mouthed or particularly assertive, although in some orga

Trying to answer the actual question. I have seen leaders/managers any style. You do not have to be big mouthed or particularly assertive, although in some organizations that may be more or less expected from a manager. What I think is required though is the ability to handle gracefully unmotivated or deceptive people, blatant liars, tired ones or those who have personal problems. At the other end of the spectrum, you have to keep a relevant distance from those you may admire, or even be attracted to. As for planning, you will have to handle a number of events that are out of your control but still affect your project. Personally I can do none of these. I am way too sensitive. And I still am a developer. I think there is easily work for 20 years as a developer, but then a number of specialties will face increased automation.