Space is at a premium. At least it is when you are the pilot of a packet-ship.
I am iDen 20786433717/190. One-ninety to you, pilot first-class. It is my job to convey the orders of The Agreement to extra-solar installations on the tether end of the information relay artery. We can only transmit detailed instructions the old-fashioned way. That’s by carrying half a tonne of code-embedded crystal through the redlines in a physical ship.
It is all about bandwidth. Out here, on the periphery, bandwidth is narrow. Why not build more routers? Easy. They wouldn’t work. Bandwidth is inversely proportional to the distance from the hub in redline-space.