Peter,
Well, nonetheless, he did provide an original look, by consciously copying the principles of the best holes (in his opinion) of the Old Country in the new country. Was his originality an accident of choosing to work with civil engineer Seth Raynor? Hey, maybe most originality is partly accidental, who knows.
Brings up a few questions. Does originality vary by region? Using your musical analogy, was Harrison original to bring elements of Indian music to western music? Now of course, he would just be "culturally appropriating it."
And, sticking with Beatle George, how much change constitutes something original? Seems like when he got sued for My Sweet Lord sounding too much like "She's so Fine" there was some sort of standard, and it was small, like only 4% of the notes needed to be different to be considered original.
I agree with your musical examples, BTW. I think many great bands had a few good albums, and then started thinking they had to writing something important, and crashed. I doubt anyone ever came up with something great when they started out the creative process saying, "I'm going to come up with something great." It just has to happen, usually by you trying your best and working hard, with a touch of luck thrown in.