Ya, it’s their inability to despawn that seems to be the last real problem with hordes. It makes it impossible to hunker down in a closet and stay quiet and hope not to be noticed as the horde passes by, since you’ll end up eternally besieged. It also allows the cheesiest tactic of dealing with incoming hordes ; cruising around the fields in a vehicle until they’ve all spawned someplace unimportant, then driving off.