I was saying only Ni-doms do those things, but that isn't what I meant. What I meant was simply that that's how I see Ni. Nothing more, nothing less. And to that I would add that, yes, of course, non-"Ni-users" can see through appearances and do the other things I mentioned--just that they're not as prone to do it in the same way that I described. On the upside, non-Ni-users are far better at doing a lot of things that Ni-doms are really bad at.
Of course, all of this is just theory, anyway. In the natural course of things, it would be extremely abnormal for someone to single out the behaviors we talk about here and give some of them emphasis to the exclusion of others; most people are far more balanced in their function-use than the MBTI is willing to acknowledge, which means that plenty of supposed non-Ni-users are probably very good at the process.
So to sum it up, I'm not trying to put anyone on a higher level than anyone else, especially not using cognitive process lineups (which I think are a little like horoscopes, in that they draw your attention to characteristics in yourself that only seem to fit the bill so well because of the very fact that you're looking).