Glib answer: centralize! Honestly this seems to be a cycle.

New management comes in, everything is centralized, big, slow, etc. The eggs-in-one-basket state.

They need to do something to make a mark so why not decentralize! Big project, political spin on whatever outcome, probably an imperfect one with some issues: complexity, silos, cost.

Next new management comes in - what can we do? Economies of scale, simplicity: let's centralize, woo!

And repeat ad infinitem...