Also by Del Tachi's logic there shouldn't be any splits in representation for metro areas that are split between states. You can walk across a short pedestrian bridge from downtown Fargo to downtown Moorhead, but once you cross that border there's going to be different representation in the House, and even in the Senate at that. Also true of Bristol, TN and Bristol, VA which don't even have a river running through them and are so closely linked they have the same name.
Texarkana is another example.