I know people here love to pile on, but I'm of the belief Moffat is simply making do the best he can with the resources and schedule the BBC is giving him.
Being the huge DW fan he is, I have a hard time believing that he wouldn't have wanted
to write a longer and more epic special. Or to have more episodes per year than what we're getting. But clearly that's just not what he's being allowed or given the money for.