In fairness, regular update and recalibration of the warp scale makes some sense. Otherwise you either end up with warp 465, or warp 9.999999997 which isn't very pithy to say in an emergency.Yeah, didn't All Good Things have a warp 13?
Maybe by the 25th century it's been recalibrated again so now Warp 15 is infinity, or something like that.