That's one of the problems I have. The writer that follows after him shouldn't have to clean up such a mess that it's easier just to ignore everything Morrison was up to. His run on X-Men was especially indicative of this kind of thing. He took Magneto and actively tried to make him so unsympathetic that no one would ever be able to use him as a quasi-heroic figure again. Most writers are expected to write things that following writers can address; why not Grant?