I think this mindset of leading to let go is quite effective especially in the military work place. I had a supervisor that would continually remind me that he was training me to take his place. He would give me advice and take me with him to do various tasks that many other co-workers were unwilling to do. As we would work together, we would often discuss the endless duties of our career field and what was expected of me. He would pour out all the years of knowledge and wisdom he had in me and encourage me to keep working hard. He would lead by example and stress the importance of learning as much about my job as possible, in order to be a competent leader. He left to another country shortly after but, instilled a very important mindset within me. Leading and guiding followers in a way that equips them with becoming self sufficient and resourceful on there own is a leaders duty. Yes, I agree with team work and collaboration, but to instill the foundational knowledge and skills needed for your subordinates to carry the mantel is just as important.
By leading to let go, supervisors, business owners, or executives are able to generate a fleet of competent, able bodied followers that can take care of operational matters while they exact their attention on strategy. Leaders can focus on the vision and strategize more effectively without always having to worry about micro managing daily business or work related matters.