No such thing as filler when it comes to the Beatles. Even Revolution 9 isn't filler; it was just Lennon trying to do something different (but failing miserably).
I agree. I do tend to take things too literally, but to me, "filler" is literally substandard songs which were included to fill out the album. The Beatles were having some issues, and a lot of the tracks on
The Beatles were indeed basically solo tracks by the individual guys, but that gave each of them a chance to flex their wings a bit. I don't hear anything on that entire album that doesn't sound like they wanted it to be there.
Remember, back then, you were either in a group or you were a solo artist, period. Nowadays, various band members can go off and do solo projects or side projects or whatever, then the band gets back together in a year or two and makes another album, or goes on tour. For me, some of the fun of listening to The Beatles was figuring out (or just guessing) who wrote what. It's just a little easier here.