Oh, and another thought I just had, because I can't help comparing Moffat's nonsense-but-it-works plot elements with not only things like the Dalek bomb, but also, say, the Cure for Every Disease Ever thing at the end of "New Earth," which still really annoys me every time I think about it. And it suddenly occurs to me that there is another big, important difference: Moffat is using his don't-make-much-sense-when-you-think-about-them ideas to set up an interesting story, not to resolve one. And that's much, much easier to accept, IMO.