Yes, i was too slow to play at a high level... Fantastic argument btw, by that logic i bet you follow a former pro footballer player his opinion since they did play? They must know best right? Thats why the best players become the best coaches and managers...
Reports about the 'Manchester City All of Nothing' Amazon show say that Pep literally called Maguire 'not fast' and told De Bruyne to exploit that. Maguire didnt get any faster since his Leicester days. What does Pep know anyway right, has he even played? It is a known weakness of Harry Maguire. He is a slow footballer, on top speed he might not be slow but his turning and getting to top speed is very slow. You can try to say that he isnt but we all watched him play and have seen it being a problem for him often.
And yes i do think that a lack of speed (slow), a lack of mobility (slow) and a total lack of acceleration (slow) can be somewhat compensated by having fantastic positioning but Maguire doesnt have that either. Maguire can be good when he is allowed to play close to his own goal and use his head to smash away everything that is coming towards him or when he can have physical duels with attackers. But Maguire being one of the best central defenders in the world? I think he has too many shortcomings for that. Decent to good premier league defender yes, one of the best defenders in the world? Dont think so.