Theory and practice of leadership

I am not very "forum-friendly", I find online discussions plain boring and full of fundamentalists everywhere and misinterpretations from all possible conceivable ways from all sides. But somehow I engaged in a leadership debate in LinkedIN. The questions was "How can there be so much written about leadership yet so little understanding?"

I don't really know the answer, but for me the question is not the most relevant, but what really strikes me would be "with so many trainings, books, theories and lectures about leadership, how there is so little PRACTICE of leadership in a daily basis?"

And to end my post, one quote that reflects a lot my way of thinking: "In theory, theory and practice are the same. In practice, they are not." - Yogi Berra