They don't need branches for printing anymore but what about control and dollar collection and retention?
By having HQ in USA and bigger branches in Canada, UK and Germany they can move money around in stable currencies and themselves around in familiar surroundings if the heat is on and use some legal representation too.
South Africa, Mexico, Brazil and Australia can have small offices in out of town nice locations for admin/control (+GB vacation) purposes. If the legal financial heat gets too much in a country then close it down and move the lolly.
Countries and/or language groups with good revenue (France, Italy, Spain, Japan) can have a couple of offices in one of the bigger branches and someone with the title Branch coordinator for that country.
A Traveling Overseer with a flat attached to a Kingdom Hall could suffice in many countries as the sole branch representative - with his wife as secretary - assisted by a local flunky or two.
Oh and somewhere in the Caribbean which is a money haven with a nice climate too!