IMNSHO, the fact that so many story-based/world simulator games focused on killing is a damning sign of just how juvenile the medium still is - both in terms of programming and direction.
Killing is the easiest thing to program. It's a binary state - an actor is either active, or inactive, and your interaction with them amounts to a variety of methods of whittling down their health bar.
It is such a staple mechanic, it's been so overused, that everyone became completely desensitized to it. It's not thrilling, it's not exciting, it's just... there. We expect it to be there, and there it is, and that's all there is to it.
When new mechanics show up, the sense of wander returns. It's just most games completely failed to grow up with us. Like high school girls, they remain the same age.