Beatles and Pink Floyd didn't have a sound engineer touring with them selling and giving acid pills, causing deaths and permanent harm to the fans who took these chemicals. He made these pills at a fast rate in his lab between touring. I have a cousin who is mentally unable to do anything since he took one of this pill. How many pills an human can take before his brain become forever severelly damaged?
Beatles said in interviews they took lsd a couple of times and they had to stop. As for Pink Floyd, their music was so far out in the tripping field, no drugs were required. My older brothers listened that music so much when I was 9 to 12, I understood and liked that music without any drugs.
The psychedelic era in music had a short life. That genre became redundant and cliché. Musicians had to work on a different canvas to express their creativity. Rolling Stones came back to basic Rock&Roll after two psychedelic albums that were borderline mediocre, except few songs. Beatles abandonned Psychedelic when they did the White album. Except no 9 who was an avant-garde piece unique of his kind. If the 2 mainstream groups abandoned psychedelic in 1968, that was a signal for other groups.
I think taking drugs was a must do thing between 1966 and 1968 for many artists but the most intelligents artists had to stop taking drugs for their personal health and to survive. The deaths of Morisson, Hendrix, Janis and Jones scared them. Also Syd Barrett who became unable to do anything., So it was death or brain death. But for Grateful Death culture, it wasn't. They kept that culture of heavy drugs as a lifestyle and superior awareness. They are drug elitists.
Discuss about Taylor Swift then. You don't have to think much, follow the crowd.