Yea I can see that the whole landscape of hip hop was different at that time. Compared to the post 2000s once Atlanta took over who basically built their sound off of the Memphis sound. When u factor that in it makes complete since why they wasn’t getting the respect they do now. At the time their sound was a niche market but now it’s the basis for most modern rap.
Atlanta didn't build their sound off Memphis. A lot Mempgis artists lived in Atlanta and helped pioneer Atlanta's sound. A Lil Jon Crunk song sounds different from a Three Six Crunk song. Three Six's brand of Crunk was more raw. Lily Jon's Crunk sound has more mainstream polish because it still retains some of the melodic style that he was doing when he made bass records. That's why it was natural to hear Usher or Ciara make their own brand of Crunk with "Yeah" and "Goodies".
In regard to Memphis, Jazze Pha was one of the early producers to breakthrough from Atlanta who wasn't Organized Noize or Jermaine Dupri. Jazze has roots in Memphis. When it came to the trap sound, Drummond Boy was one of the architechts and he's from Memphis.
Three Six starting getting their respect last decade when Juicy J had his solo run and was getting embraced by new artists. Then therewere all these artists who came up listening to Three Six.
Memphis never really left mainstream Hip Hop because during Wayne's come up, T-Mix had several key songs on
Carter 2. He had tracks including the single on Birdman's album from 2005. There's the
Like Father Like Son album.