> Large companies are all decentralized. The ceo will set broad direction but they always leave details to the lower levels.

Typically, central planning does not imply micromanagement. The "broad direction" you speak of is the central planning.

> Companies are reorganizing for efficiency all the time.

But, of course, companies wouldn't exist if markets were perfectly efficient. The sole reason for companies is to exploit the efficiencies of central planning. But, of course, just as if markets were perfectly efficient there would be no companies, if central planning was perfectly efficient there would only be one company, so... Like always, there are tradeoffs that we have to find balance in.