Point being, NeiBIOS is much more insecure by default than NetBEUI as it can be routed. That you can make it more secure afterwards is of little help to those who doesn't know how. I know how, as part of my work involves server security, but most ppl don't.
Why take out a protocol MS had working nicely in Win2k and still include AppleTalk that not even Apple wants to use?!
The users should be able to decide which protocol they wanna use to share files on their local network and not be forced by MS to conform to their will.