I understand this, and I do not mind having zombies that are nearly impossible to kill from stealth. The Navezgane Hospital is actually a great example of this system working as designed, the zombies spawn in areas where you have to do something that will wake them up before killing them, but having them spawn in only after the trigger point is reached is not a good design. if the hordes spawned in, but were in an area where you could not reach all of them without hitting the trigger point it would still be fine but a stealth player is not going to be carrying large stacks of ammo usually, because it negates the feeling of the stealth to just spray and pray every 10 seconds. Another POI that works well with the "wake up" triggers is shotgun messiah, there are 3-4 points in there where you open a door, which wakes up a horde ahead of you. but no zombies spawned in the cleared area behind you. I get a tier 5 should not be 100% stealthable but the number of ambush points that you have to be fully prepared to sprint backwards to avoid being cornered is out of control. Also, it leads to an increase in bugged spawns where a zombie might reset when you put enough distance and time between you and the zombie, but not respawn in because the trigger needed had already been tripped. Also had this happen in the shotgun messiah factory where a zombie dropped and couldn't find me after my stealth kicked back in, and reset to default position, but I could not respawn it because the flag had been tripped once.