Numerous qualities are needed to lead others. Nothing strikes more true to the core of leadership than the need for proficiency. A lack of proficiency leads to a loss of credibility, which destroys leadership influence.
Leaders must be skillful, competent, accomplished, and adept. Proficiency can be learned, but it involves time and requires hard work. Mastering proficiency is worth the effort
Leaders must demonstrate an ability to do what is needed and achieve a quality level of performance that can only be described as proficient.
When leaders are characterized in this way, they are capable and efficient.