Ni is subjective. How can this be a good thing?
If intuition is about abstract connections and implication and as well introverted intuition has at its heart some engine that separates concepts from objective roots, then for example pick any objective attribute you like--age, race, sex, space, time, relationship,... whatever--and Ni can strip it away from the concept to investigate where what's left fits.
What does Ni do then? I guess it's a process of searching for identities: what is this stripped concept the same as?