We know for a fact people without the required points obtain tickets via SC's, how is that not them gaining priority over people not belonging to branches? The SC system may pre-date the points system but the people within the system don't. Granted, there might be a small handful that do, and those people have the points to get the tickets themselves with a few clicks of a button or a phone call and wouldn't be inconvenienced in any way if SC's stopped getting an allocation, but the overwhelming majority don't fit into that category and thas the problem. SC's essentially do get first crack, If they didnt get their own pot of tickets, more would be available to "ordinary" points holders.
Your post boils down to SC's have always had an allocation of tickets so that should remain and be protected. Times change, a vastly superior and fairer system was brought in with the introduction of the loyalty system, the club should have stopped SC's access to tickets then in an ideal world but because they didn't back then, it doesn't mean they shouldn't now.