OMG.. what is with you peeps and boobs. Yeah I know boobies are super important but O M G why go on a tangent over "canon" boobies? To me, "canon boobies" are milk jugs where nursing mommies shoot at the dad to keep him horny.
If I watch a show, how they look grows on me. When an artist changes any aspect of that, it makes me less attracted to the character. Even to the point where I prefer just normal non-rule34 characters because they don't look "wrong".
Be glad you aren't like me and can look past it. I honestly wish I wasn't bugged by it either. I even waited to play this game because I was so sure they'd change Toph. I was so happy they kept her canon, which is why I finally got around to playing this game.
With that said, it's an amazing game that comes so close to being perfect. If they kept the breast sizes canon for all characters, this would be a 10 for me. Right now it's about a 8 (I like my boobs, lol).
Is it really censorship if the dev themself decide not to include it
Depends on the reasoning for the removal. I looked through the change logs and tried to find a reason why these don't exist in the game. Had no luck.
However, I do find that putting a small breast scroll in the game and then having her boobs still be (arguably) a C cup is pretty frustrating as a small breast lover. I noticed in Book 3, the small breast scroll actually makes her boobs smaller than it does in Book 1. I wonder if they'll go back and change Book 1 at some point.