I don't have the time to write a proper reply, but this discussion has been had on discord a few times and the answers were generally as follows:
Monster spawning depends on density rates. The idea is to get more nobles in fewer regions to actually promote interaction again. On Dwilight for instance, even without the big monster invasions, we hardly saw any pvp action and war. I do like the idea of the rogue range, but it will be quite some work I'd imagine.
BT also had little pvp action other than an upcoming assault of Nothoi/Fronen/Gotland vs BK (and whoever helps them), but it was just post invasion.
