The LSD use is beginning to influence their music at this point. This turned off many of their older fans. However, I love the later years of The Beatles. Not because of the drugs but because they began showing how talented they were musically.
“Here, There and Everywhere” is such a good song although very mellow.
IIRC that was also the time John Lennon made his “more popular than Jesus” remark.
They became a production band at this point. Nothing wrong with that, but they were recording songs they could never replicate live - and had no intention of playing anyway.
Some bands made it a point to sound the same live as on a recording (like Skynyrd). For the Beatles and George Martin, it wasn't even a thought.