Hip Hop is definitely not the most versatile genre in the world. That title would have to belong to rock music. There's really nothing to debate there. However, the idea in your head that Hip Hop has only recently become versatile is entirely fantasy.

The 90's had G-Funk, Crunk, Chopped & Screwed, Horrorcore, Alternative Hip Hop, Boom Bap, Bounce, Miami Bass, & Chopper, which were all uniquely sounding subgenres of Hip-Hop. You're a fool if you think they all sounded alike in the 90's. They were more versatile back then than they are now.

Also, you talk about Nas as if he is a modern rapper. Lmfao, Nas debuted in the same era that you say isn't versatile and then used him as an example to explain how versatile Hip-Hop is today. How tf does that make sense? If you're going to make a case for how versatile modern Hip-Hop is then you should at least use examples of modern Hip-Hop artists. Wtf?

However, back to my original point... Rock is hundreds of times more versatile than Hip-Hop will ever be. Metal and Punk both started as subgenres of Rock before becoming genres in their own right and, themselves, spawning subgenres of their own. There are literally hundreds - if not thousands - of subgenres, microgenres, fusion genres and derivatives of rock music.

Rock music is so big that the fans of it's music developed entire subcultures around it. You had rockers (rockabillies), hippies, greasers, deadheads, goths, cybergoths, emos, scene, metalheads, crusties, psychobillies, riot grrrls, surf punks, gutter punks, straight edge punks, skinhead punks, neo-nazi punks, (enter name here) punks. All of these were entirely different subcultures that developed because of rock music or one of its derivatives.

The only subcultures that came from Hip-Hop are like mainstream rap culture, wangstas and juggalos. Hip-Hop simply can not compete with how many subgenres or subcultures that rock music has developed over the years. Rap music simply doesn't have the diversity that is obvious when you listen to Elvis Presley before transitioning to Ozzy Osbourne; the Beatles to GG Allin, Metallica to Cannibal Corpse, etc. I could point out even more polarizing extremes but I chose those artists to make my point because more people are familiar with them. Hip-Hop isn't anywhere near as diverse or versatile as Rock music, regardless of which metric you use to measure it.