You have a good point, and one I have spouted on about for years. Footballers are not the cleverest people on the planet, and by confusing them with over complicated tactics, and restricting their need to express themselves, will only ever result in tears. This is the reason the football was so attractive under Harry, and so damn boring under AVB. In my opinion a managers job is 80% motivation, and 20% tactics.
I'm fairly certain the average footballer is more intelligent than the average person.