Different players have different needs. I love fighting the monsters over and over, some find this dull. Some would love to have wars that don't seek annihilations, others would find wars over a mere region or two to be unmotivating, the stakes being too low. There are several wars where total annihilation of the enemy was amply justified, but people were angry at how hard it was to achieve. Just as there are many where realms died seemingly too easily.
And for the record, I really like the idea of making monster spawns dependent on density. The biggest problem I can see with it though are at the choke points.
