I'm not regurgitating something, all I'm saying when something isn't law but is policy/rules then it is susceptible to legal challenges.
Of course it could be challenged but I doubt if it would succeed. Courts are very reluctant to get involved in sporting disputes and when they do (which is rare), they tend to side with the status quo - eg Steve Foster being banned for the cup final. I'd imagine that challenging a principle that has been (near-unanimously) agreed would get short shrift from any court