Don't forget that the modern style is to break the company up into separate pieces. The idea is that each department will then try and do it's best - but they forget that they are part of a process. If each dept is succeeding
on it's own terms then they can ignore the departments before and after them in the sequence.
That's the short explanation, it's complicated by multiple managers all reporting that they are doing brilliantly and no one having overall control - at an operational level. The company is too large for anyone to hold it together and that is the curse of EVERY company, charity, govt that gets too big and old. Look at the USA still clinging to the idea of having one person as head of all the tribes? That won't last. The only way for big companies and govts is down - even as the mgmt produce pretty graphs to show how well they are doing.
I've been in mega global corporations and seen it at first hand.