Of course, a lot of NTJs are smart enough to recognize the limitations on the powers of their own Ni, like say, Kalach (who I still think is one of the smartest posters on the whole forum.) Note how he doesn't run around claiming that he's good at all four NT functions--his perception is strong enough to recognize that it has blind spots (unlike yours.)
It's just some of you that delude yourselves into believing Ni somehow magically encompasses all other functions and gives you a complete view of everything. (Your poor comprehension of Ne/Ti reveals otherwise, though.)
You're gonna need to accept that Ni is not any better (or worse) than any other functional perspective in order to get over this.