Finally got through that monster of an interview. Good read, though not super high on new info.
Most interesting thing to me was that if you play on Hard/Dark you will get less stats when leveling up, so you have more dependency on gear upgrades. He also says that exp gains are "less generous" on Hard and Dark mode.
The impression I get from the combination of monsters stay away from large groups and that guards will kill them if they do, is that seeing monsters attacking a town will be a very rare sight.
Yeah, you're probably right. I do see the reason for it though. If they allowed monsters to dynamically attack towns, either they would have to make quest-bearing NPCs invincible, which would be strange and immersion-breaking, or else some quests would be destroyed randomly through no action of your own, which would anger a lot of gamers.
Who wants to be gypped out of parts of their game just because a group of monsters wanders too close to a town and decides to attack it?
I'm sure there are other ways to handle it I'm not thinking of, but they would likely be a lot more complex to implement.