Personally I think most managers could do with watching TNG rather than TOS. Picard is the quintessential leader. He always asks his crew for input on situations, defers to their expertise in their chosen areas, puts trust in his crew rather than micromanaging, treats everyone with respect, listens to people, values empathy and compassion, values diplomacy over violence, values democracy over tyranny, knows when to compromise and when to stand firm, knows when to take risks and when not to, constantly self reflecting, instantly takes initiative in crisis situations, never loses hope when on the back foot, constantly improving himself through learning and culture and takes full responsibility for his actions including taking the necessary steps to rectify things when he gets things wrong. What more could you want from a leader than that?