Thats good Hombre, of course melodically its not up there with Hey Jude or Something and lyrically its incredibly simplistic from the man who wrote Strawberry Fields & Walrus.
Surely John thought how this song was going to be recorded even before writing its few words. Actually John was at a quite simplistic stage at this point, just think about his other two important contributions to Abbey Road
: "Come Together" is clever word-play with great backing instrumental, but the sung melody is also repetitive with few variations; and the lyrics from "Because" are as simple as effective and beautiful. I believe John had a minimalistic mind at that point, that lasted at least until his under-produced Plastic Ono Band
Id have done it differently though instead of cutting it off Id have increased the volume and then slowly decreased it to a fade like A Day In The LIfe final chord
I agree, never quite liked that abrupt ending. And the B-side ends with "Her Majesty" instead of the perfect "The End"... Thus, I think one of the few weak points of this fantastic album is how both sides are ended. But our Beatles were transgressors of the norms, weren't they?