Anytime you bring up the fact that Uber has far too many engineers someone inevitably brings up the a defense along the lines of "you don't understand how compl

Anytime you bring up the fact that Uber has far too many engineers someone inevitably brings up the a defense along the lines of "you don't understand how complex it is" or "they operate in so many different markets, so of course they need that many". So your theory is probably correct, economies of scale don't exist. This is the same reason why a delivery company in Texas isn't also doing bike courier deliveries in Hanoi. On the surface it is very similar but they really have nothing to do with one another.