Why no close ups?

I have not read any thing about the production of this film. Does anyone know why Chomet decided not to cut to any close-ups of the characters? The entire film was longs shots and medium shots. The camera work overall was much more sedate than Triplets, and I realize that the story is an entirely different feel, and thus reflected in the cinematography. But for such an emotional film, I really would've liked to have seen a face or two fill the screen.