No one justify anything, as player i have no knowledge of how certain things should work or not, we got informed that this thing should not work as it so we stopped using until fix comes up.
For myself i rmb this from live as a core mechanic of everyday RvR battlefield, and as it didnt get changed in RoR myself assumed this is a completely normal and well known thing.
Video has only purpose to show how great City Sieges can be with Organized groups on both sides, hope more of it will happen in future.