Great observation (Macbeth could tell you as much!). I would love to read a fic in which Buffy and Angel are soulmates, destined to be together through all eternity, and it's a horrible thing and they hate it.

B/A is actual the kind of dynamic I'm guaranteed to be least interested in, so whenever they're together I get bored. But I can see why it appeals to other people.

Yeah, that last question doesn't work for everybody. But I hope you enjoyed the TICKY answer!