its just formulated different now
for one, they're not labeled remixes, rather just #2,3,4 etc
and the lines have disappeared....rappers used to only feature label mates and their crew so somebody outside of that was a big deal....so much it had to be announced to every coast as "THE REMIX"
but now everybody fucks with everybody and there's not many distinct sounds from one area or label.....southern artists gettin w/ eastcoast producers, NY artists gettin with west coast producers, and all flows and styles are fair game