It`s not a problem if he is lazy when we are defending. He is like that for many years now, same as many other attackers. The problem is when he is lazy when we attack. He is just too static and quality opponents shut him out of the game. It`s not a coincidence that he disappears in many big games lately. Quality teams know how to cover space and he doesn`t move too much to receive the ball, therefore he is out of the game for the bigger part of 90 minutes.
I disagree that Messi disappears in big games, hes been amazing in some big games lately. But what I'm starting to realise is that if the opposition in on the front-foot during the game, then it is always the case that Messi is shut out of the game. He rarely plays good when we play bad.