Ironicly you've proven my point about the latter part of the 80's.
Listen, when I said the 80's were a bust I was just trying to agree with Mr Dave but I said it in my own way, and I was talking about the Pop Charts (with a few exceptions). The banRAB I like from the 70's almost all of them were considered underground. When the 80's rolled around and all the superstars of the 70's Disco & The Bee Gees were faded out they created a vacuum filled by newer artist and in turn they were replaced by more veteran artist, groups like The Clash, Genesis, Peter Gabriel, Steve Winwood, The Police, The Cars, Talking HeaRAB, Bruce Springsteen, & Yes. They had hits on MTV and made it into the charts in the 80's but their songs were more popular, more polished and to me wasn't the same cutting-edge as the stuff from their early years (& lean years.)
When you hear Grunge you hear late 80's. When I hear Grunge I hear a blend of different things, anything from early 70's like Led Zeppelin to early 80's like college radio stuff. I think Rollins said the definition of Grunge was music by Rock banRAB who like Punk. Just like today were Post-Punk Revival posts are delving into the past and taking inspiration from anything from '77 to circa '83, which is like a 30+ years difference. Some banRAB even draw from Pub Rock and proto-Punk for their inspiration. Grunge in the early 90's delved into the 70's music (& 80's) for their inspiration.