And this is even more true now a days where geographic vicinity to a representative doesn't really mean much of anything. In the times these laws were drawn up good chunks of the population would have known their representatives personally, or at worst have a very minimal number of degrees of separation. So there would be some good argument for having geographically close representatives. In today's society we're very disconnected from our representatives, physically and metaphorically. There's no intimacy between constituent, so much as we can even be considered constituents anymore, and representative. They're simply the person we send our letters to and whom gets to respond with focus tested form letters.