However, when I read @Xander's response my mind started going in a different direction. I am constantly surrounded by ISTJs in my daily life and everything you say of INTXs could also be said of them. They do feel, they have trouble with nuances and they do approach the human side of life in very simplistic black and white terms, which is why people so often misunderstand them as not having feelings. Of course they have feelings. They also feel deeply.
Could it be that what you describe is actually applicable to IxTJs as opposed to INTXs? I mean both INTJs and ISTJs share the same auxillary and tertiary functions. Perhaps, you have uncovered an aspect where these functions play out similarity in the two types.
If so, then is it likely that INTs, depending on their other functions, will not approach feelings and relationships the same way?
@grey_beard, tsk...tsk. Haven't you heard? My kind has ESP (that's what it says on the Internet and the Internet is like TV. If it's on there it must be true.) You can run but you can't hide. Just like Xavier, I can sense your thoughts, put on my helmet and locate you.