What exactly is the problem with the current system where spawns ramp up over time, which is relatively brief in most cases.
Performance, for one practical concern. Processing this takes a considerable amount of the server's processing power and depletes the available entropy considerably faster than NWN normally has. Every time one complains of cooked dice rolls, this is one of the key contributing factors, I'd think.
I feel like of the many practical answers one could have for this, an outsider's view on the inner-workings of a system you aren't privy to isn't the most helpful. How can you possibly know the engine without being able to peek under the hood? Are you a Developer?
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...Frankly, there's a far simpler answer to this, and one that no-one's actually brought up thus far in the room. It's that the current system has a very
broad CR range. It doesn't stop chain-grinding, but it does disadvantage most players from having a pleasant experience with it. In my experience, personally, I wouldn't go dungeoning seeking a high spawn, I would seek dungeons far above my level in anticipation that the spawn would be low, and then run those dungeons in a chain grind. You can effectively dungeon content five to seven levels above your own with a well-rounded party on a low spawn. If you want to encourage the low spawn, going inside and killing one or two mobs and then leaving for the area to reset will lower the dungeon's rating every time, until it's at a spawn you can handle. People who power-level on this server usually use that method to get the best results in a very short amount of time, and then focus on heavy roleplay during their XP cooldown, which is why you might see that some people seem like they never actually dungeon, yet manage to be level sixteen in two or three months of playtime.
So having the broad range just confuses people, and makes the dungeoning system inconsistent except for people who know how to game the system. It shouldn't be that complicated, and the dungeon ranges shouldn't be so wild. You should be able to get XP, just
less XP. As it stands, most of the time you either feast or famine unfortunately. It's a terrible system. Some people like it, but I'd wager that's entirely out of an acquired taste of familiarity versus objectively observing if the system is very fun, or engaging.