it’s not efficient from the perspective of organization. But the thing nobody tells you here is that packets have no predefined route, they take whatever route gets them there optimally. So it’s highly redundant, and very fault tolerant. When you consider that, for what it does, it’s a highly efficient routing system.

To the point where you could cut an undersea cable, and traffic would still route perfectly fine, albeit probably a lot slower, assuming that isn’t your only connection of course. The fact that it works it all is kind of a miracle.