He can relate better with what he's doing or using but as someone who wants something good to always happen for his team to move forward and to progress, he had to change his pattern and try something different, that's why Pep Guardiola is better than many coaches in the EPL no matter how poor his team performs he's still the best.
The management of the Red Devils can't interfere with the formation of the manager, they can only say they don't want a certain player in their club, not with the strategy of the manager, if they do then they as the owners only want the down fall of the club and that's where you see the fans showing their anger, there's still time to make the club great again.