Depends. It generally seems to be a stat that's ignored in football outside of centre halfs these days. You need to be able to defend set pieces in your own box and then depending on how you want to play have attacking options up the field.
Man City can play a back four of Walker, Dias, Stones and Garvidol and sit Rodri in front of them with Walker being the shortest of the five at 6ft should they need to. Height is a useful option to have in the squad but not essential for every game as a lot of teams have moved away from a target man style centre forward. Man City being one of the few who actually still have one.