Modern-day companies tend towards size or complexity (the two are not mutually exclusive.) Both paths allow for highly specialized functions and a diverse array of abilities.
This comes at the cost, however, of agility. Capital construction asset owners in particular can integrate engineering, sales, contractor management, and other functions under a single umbrella. Each function has its own culture and goals that can be difficult to shift on short notice. When this umbrella has to work with the many other limbs of the giant corporate monolith, that shift grows ever more difficult.