Imitation of the elite is as old as the sun, and happens in every field. No one in their right mind is going to reinvent the wheel, unless they are a managerial genius who will then rise to the top, and everyone will then just copy him.Well, look across football. There aren't many coaches who adopt original game models. So many of them are copying and idolising Pep.
Coach education is really poor right now, particularly in England