I generally agree with what is being said about mood.
Being receptive to the environment (rather than one who actively tries to imprint on the environment) makes INPs vulnerable, even the INTPs (although I think it's easier for us to wall ourselves off... but that's not really a positive, that's a defense mechanism).
I'm also not one to want to change my moods. My natural instinct (although I have shifted some after having many life experiences) is to view that as inauthentic -- a lie. Maybe that's due to Si tert, at least with the traditional type discussions, it tends to root one's mood within a sensory experience (recalled or current) and aims to create a consistent timeline of mood. Who knows? I just know for me, when I'm sad, pretending I'm not (or having others try to "cheer me up") annoys the crap out of me. It just is what it is. The quicker I embrace it, the more I can move through it and out the other side. I'd rather go to an environment that aligns with my mood.