I'll have to look more into it then. However I still consider hiding your private network to be a good thing, if for no other reason then privacy, even though traffic might be blocked. And I am aware that security through obscurity is not a good form of security, however when added on top of other properly secure methods, it's an addition, no matter how trivial. As for NAT I do wish it went away as I've had nothing but troubles with it. But it did play an important role with IPv4.