#6: Consumption and excessively pretty childbirth deaths! Husband sits pensively outside while clerics Do Things to make his baby happen. Clerics shuffle out, grim faced... "The child is well, my lord, but... your lady..." Commence bittersweet baby snuggles.

I mean, I've never known anyone who died giving birth, but it's not so much the commonality as it is the formulaic telling of it that gets me, both in fic and elsewhere.

Also unsurprising mention that #2 sounds A+.