Heian can feel kinda empty at times as you travel from point to point and while you could add curse spawns to help make it feel more alive, I don't think that will remedy the issue, as most of the time people will just run past the curses and ignore them on their way to a seal or extraction. However If a high grade curse is spawned to protect a seal, then I think that issue will be mostly solved, as even if there are no players to contest the seal, then there is still an element of action. Bonus if there are players as it would add another layer of difficulty to taking one.