It made me sad as well, but I still enjoyed it. I had not made the schizophrenia connection (I haven't had any firsthand experience with it), but that seems like a really astute call.
I think, given some sense of how Gondry thinks, the character was probably more meant as an exaggeration of the, uh, tyranny of his own creative impulses/imagery. Slash lack of social whatnot, who knows. But I like having your take in there as well.