Statistics prove goals are overwhelmingly more likely to come from short corners.
So City use short corners and score more goals than anyone else from corners, even accounting for the extra amount of corners we get.
Even when you don’t use short corners, having someone available to take one pulls a man out of the box which makes normal corners more effective.
The club spends millions a year on the best coaching staff in the world to be guided by the best analysts and if they do something it’s because it works.