I'm w/you.
Variety? Grunge is variety? Gimme a break!
It's all the same whining mush-mouthed deliberately nasally white boys guitar-grinding constant-noise garbage. And alot of the '90s and today is the same garbage. Girls who "sing" like they have speech impediments, who must always be distorting their mouths to make the stupid I-lost-control speech/singing patterns.
Do you ever have black groups? Besides rap? It seems everything '90s+ is either white grungy, or black rappy. That's real variety. All 2 of them.
You probably won't get what I mean; if only I could demonstrate the stupid things they do to make those sounds. Bottom line: none of them enunciate at all, and some deliberately are distorting word formation. Drives me crazy. And goes w/their "style", too - lazy, dirty, disgusting, dregs of society.
RE: '90s+
Also, can't forget Lesbo-folk, sort of a grunge variation I suppose, but distinctly post 80s.