Why are artists who have really good construction, use of space, value, all that junk, usually really bad at character design?
You'd think someone as advanced in their craft would be able to spot their weaknesses, and this doesn't only apply to Japanese illustrators, but many western artists' original characters (that are not your generic space marine/medieval knight) are usually shit.
Character design usually revolve around the same stereotypical overused shits. It's kinda hard to be truly creative and original in that field.