One thing that you realize would be detrimental to crew performance would be a leader who is overly concerned with keeping employees happy at the expense of performance. What leadership style is this?

Laissez-Faire Leadership style

Explanation:

A leadership style defines the way or technique used by a leader to motivate, direct his employees

The word "laissez faire" is a french word which means "let them do"

It is usually in the new startup that the leaders follow this type of leader ship Style. The leader lays full trust on his employees and he just looks at the overall business of the company.

The leader compromises on the overall performance of the Company but manages to keep their employees happy