Off the top of my head, here are R & R bands from '88 onward who have been producing high quality music that will be in my musical rotation for years to come: Wilco, Los Lobos, Old '97s, Black Keys, Kings of Leon, Pearl Jam, REM, Weezer (I realize some of these bands started before '88, but my point is their careers have been very relevant from '88 onward). Of course, outside of those bands that I listed towards the end, they never hit it big on the radio, they did not come up during the arena rock era, so they're not going to be featured on classic rock radio stations and many of these bands came into existence/relevance in the post-MTV video golden age, so they were not consumed by the masses or even the edge of the masses. Where would Nirvana be without Smells Like Teen Spirit video? Pearl Jam without Jeremy? Soundgarden without Black Hole Sun? REM-Everybody Hurts? I haven't seen any of those videos in years, but because of the pure repetition of their airplay (which coincided with my college years), I can envision those videos without giving it a thought.
The narrow specialization of everything that the internet brought to us has taken away the shared experience. You might have hated grunge or hair metal or hip hop or tear jerking ballads, but as a kid in the '80s and '90s, you knew Nirvana and Poison and Dr. Dre and Sinead O'Connor because it was inescapable. It may have sucked at the time, but there's a shared experience there that doesn't exist with music today, no matter how much better the music might be (and I'll again reference the bands I listed above, along with acts such as Chris Stapleton, Sturgill Simpson, Tyler Childers, who are working the outlaw country territory mighty damn well). It's easy to find your niche and stay inside that world today, unlike times past.
Finally, that Gene Simmons is positioning himself as the arbiter of quality music is rich. I don't have anything against Kiss, but they were considered a novelty back in their heyday and I don't think anyone could credibly argue that their catalog stacks up against the titans of the classic rock era.