That's an interesting thought Chuck. I've wondered before whether composers were sometimes writing music that they could peform or writing for a virtuoso's skills. I don't really know enough about Debussy and his biographical information to know what kind of a pianist he was.
I'm more familiar with his orchestral work than his solo piano pieces, though I do have recordings of I think most of those, and from several different pianists. Pretty challenging piano pieces, great skill would be needed is my guess. (I have playad piano, but I'm no judge of difficulty as I'm awful).
If I had to guess I'd say Debussy's skills weren't up to it, but that's just a guess.