I get what the OP is getting at
I think what did separate X a lot from the others is his production was so different. The Swizz Beatz and even Dame Grease and P Killer to an extent, had a much different sound that didn't match really with traditional NY rap. X's content was also a little bit more vulnerable than most NY rap at the time. I said it before, but there's no album that sounds like It's Dark and Hell is Hot. Before it or after. It's really a very unique project, from a sonic and lyrical perspective. It really differs from even other hardcore acts you may associate X with like Onyx.
X's sound did stray from traditional "NY Boom Bap" sound when he blew up. A lot of "real heads" used to shyt on Swizz casio sounding beats.
Album is 1 of a kind like u stated. I was at the age where that was probably the first classic I got to experience in real time where it really impacted me. Always gonna have a special place in my heart

I wish grease and P had more work. I was excited when dame started fukking with max and French. They made some shyt for what it was.