I think the recommended ports to connect for particular sats is more about convention and ease of quickly identifying with port is carrying which satellite if there are not labels instead of having someone (lost of Dish installers work alone these day) check the TV to verify which port is which satellite when it comes to whatever the tech call is about: troubleshooting or upgrading. It sure makes things easier and if a change out of reflector or LNBF that results in no longer having a need for, say 118, then it would be a NEAT appearance and neat and logical use of ports from an somewhat perfectionist engineers point of view just to have the last port unused and have the first ports for the legacy and forever owned sat positions, unlike 118, 129, and others, for example.
I, too, have had this and a previous switch with "recommended sat lines NOT in the preferred port, and it make absolutely NO DIFFERENCE. I think this is more about "systematization" (?), doing thing in a neat and orderly fashion with logic being that ports 3 and 4 are for expansion sats just for the sake of having ORDER!