It's not so much LLP's coming in optimal size as Communities being of an optimal size. Especially a "Community of Interest" like this one.

The LLP merely offers an infinitely flexible "Open" corporate framework shaped by a consensually agreed common purpose and principles of governance.

Plus, of course, the "semi-permeable membrane" of limited liability, that hopefully would serve to protect Jerome and co-conspirators from legal action by aggrieved Russian billionaires or retired Central Bankers...

"The future is already here -- it's just not very evenly distributed" William Gibson