I dont see it, tbh: Couching is a pain, but it IS pretty balanced: I walk away from couches all the time when in peasant rags....
ALSO noobs: You know you can chamber couches, right? You dont HAVE to try and dodge if you have no shield, couch counts as a stab and therefor can be chambered with both stabs and overheads, just practise it for a while if you're a 2h with overheads, soon you will be destroying the cav-man's head as he rides past. With polearms I would personally go for the stab chamber, since you are gonna stop his horse, and then, well, it's facegravy time once you have his horse stopped.