I hated Moffats asspulls with prejudice! Shit didn't make sense.
You're not the only one, not even on this forum! Moffat's tenure is super divisive to this day. I hope I'm not coming off as an ass, as I don't mean to. It's just the Capaldi era is my favorite so I want to defend it a little!
RE: your spoiler, if you're referring to the series 9 finale: I would argue it's not casual at all - it's the Doctor absolutely going so far, which is part of what Hell Bent is about - it's a critique of the Doctor/Clara relationship not being healthy for either of them, even though they both care about each other a great deal.
If you're talking about the series 6 finale... I've got nothing lol. That's one of the asspulls I didn't like.