Guessing that if they could be used at 11 month window that gives an unfair advantage, ie I own OKW so if I want 2 studios at BWV lets say that total 24 points at 11 months then I am cutting into a BWV owner's priority booking window, so i'd think that's why
DVC has stated these 24 pts can only be used to book at 7 months or less, otherwise they'd have a whole new set of issues to contend with.