As an outsider (non-American breh growing up in Africa and Europe) it's amazing how much Black music I discovered thanks to HH. Maybe it's less obvious for American brehs since you grow up in that environment so I guess you have easier access to older stuff, but for me it was huge. Like some breh said here, listening to HH used to be a lesson in classic Black American music.
I don't who said it, but the fact seems to be that 90s producers grew up with their parents listening to those older styles. So obviously they would be more influenced by it. I mean when you listen to Rza and Snoop or whoever they always throwing in random names. But fast forward 20 years, the disconnect is there, these kids probably grew up hearing their parents listening to RR lol
Anyways it's much deeper than music too, because HH used to carry the past within those influences (and samples), meaning that one could feel a connection to a longer history. Music in this aspect is much more than entertainment, it really does "carry a message", there's a reason it's been around with a strong social role since forever. Now think about that and think about what it means that today's music has less connection with older music, and put that in parallel with lack of respect for older folks/struggles and/or the loss of the sense of being part of a community.