My perspective as a 60 something guitarist.
When Elvis came alone, the big band generation thought it was junk. Then it was the Beatles, Stones, etc. Next came the heavy stuff Hendrix, Sabbath, etc. and so on.
Somewhere along the way, skill and musicianship got replaced with sampling and likes. In rock music there are far fewer gifted players then there used to be. There are no more Rick Wakemans, Richie Blackmores or Neil Perts. No one could even begin to produce a "Dark Side of the Moon" or Bohemian Rhapsody any more. Don't have the talent, don't have a clue.
That is what has changed in music over the years. Styles change, like them or not, just like square soulless, plastic guns. But, the days of Danny Gatton and Santana (registered magnums and Pythons are history.