The official story may vary, but from what I have seen from for instance Paul McCartney, he has talked about LSD, cocaine, and even heroin sometimes, saying "he didn´t know what it was". Which says alot about the reckless athmosphere they were in. Which unfortunately is true in many parts of the "music industry". Also modelling industry.
Somewhat related:
You know when Kurt Cobain was a star, nobody said he was a herioin addict, and his "wife" a prostitute.
The loudness war argument actually is said to have started with their album "Nevermind". But people process things now, even louder, and sounds better.
Infact, they should be happy their album sold at all.
Point is "official information" written many places, by fans or official spokespersons may be formed in a way believed best for the viewer.
What if they said "Yellow Submarine" is a movie about LSD-vision from the point of a penis, and mostly is about recieving semen, and the most offensive of gay fetish symbolism, which they mistook for Hinduistic-like insights?
(and probably "love")
Nobody says this.
Now try the compressor, and be a Beatle in one-two-three, as it is an instantly recognizable sound. And throw atleast one sitar in there.
PBWY.