The aim was to provide a “single version of the truth” for financial and business performance, allowing more rapid decision-making than supported by the earlier patchwork of system
Exactly how rapid do you need to be for decision-making at that scale? If something goes across vast swathes of the business then I would expect it to be far more measured than "quick - get me a number out of the computer and I'll say 'do this' or 'do that'"