Simulated Patch day spawns...

[Nocte]

I think the simulated part implies that it wouldn't actually require a server restart, thus negating the motive of crashing a zone to respawn things.

It does mean that staff would have to schedule time to jump to all the raid zones and repop everything once a month (or whatever the schedule would be), and I believe I last heard that they don't want to take the time to do that.