I’ve always put it down to selection bias. Listening to a 60’s/70’s/80’s auto generated playlist on YouTube Music will eventually run out of the hits of the era and get into the weeds. The terrible, terrible weeds.
But according to my parents that was the hay day of music. It goes to show if you only listen to the good stuff then you’ll fool yourself into thinking that it was all good.
Yep, plenty of bands with 1 (ONE) good song in the entire career. I made some mistakes in my youth buying an album based on a successful single and everything else was utter crap.