See, s5 made almost zero thematic impression on me, whereas s6 is a story I've been desperate to see told ever since... uh... the first few episodes of s4? The story where the Doctor gets way too big for his britches and finally gets taken down a peg or sixty and accepts that this is pretty much necessary. Everything Moffat's been feeding us since Silence in the Library--time can be rewritten, the Doctor as a mythical demigod who can win battles just by namedropping himself--he's been building up so he can go "actually, this is a terrible idea and just because you can doesn't mean you should" and kill off the side of the Doctor who's capable of that. And as much as it frustrates me that Moffat is not great about showing his work, for s6 I am willing to do the necessary handwaving, because it works as meta commentary: rewrite time too much and causality breaks down and everything gets disjointed.