There is no argument mate.
You’ve made a daft statement. This city team consists of 11 equally important positions.
Guardiola is forensic in his detail and understanding regarding the full back position. The full back position in a Guardiola team is of extreme importance.
He goes as far as cutting the pitch into several zones and mini zones. Each position has important work to do within and external to his own zone. Including the full backs.
Hence Guardiola going out and getting fullbacks he needed / wanted and spending big to do so.