The bind is tricky: If in their world explanations of why things happen are irrelevant, then they are perhaps excused from not telling us any more than they do. Nevertheless, I hope that in their next book they will indeed give us the opportunity to consider their work more closely.
The jocular book they have written is full of amazing incident. But its characters—despite their delightful capacity for passing through second order change at a moment's notice according to how their situations are defined by the authors—remain inscrutable.