Devs want players to feel stealth is a viable option, but also feel the need to have encounter triggers that make stealth practically meaningless.
This is my biggest problem with the sleeper triggers that are location-based. I get the need for pacing, but part of pacing comes from how the individual player chooses to approach a POI. The auto-wake triggers force a particular type of pacing on every. Single. Player who enters that particular POI, regardless of their build, or their chosen playstyle. This...isn't great.
I love playing stealth archers. I rarely use handguns of any stripe until FAR late-game. I enjoy the challenge of sneaking through a POI, finding the sleepers and taking them out. When I hit an auto-trigger, it's almost always obvious, and it's hugely frustrating, because it has NOTHING to do with the choices I've made (for good OR bad), but simply because the POI is set to trigger this sleeper volume the moment a player steps on Block X. It renders my stealth build completely moot, and is completely outside my control. It's INORDINATELY frustrating.
I'd be fine if each sleeper volume was set to have a random % chance to hear me, and that some would sleep through stealth more easily than others, and you'd just never know. Then, at least, my Stealth build would have a legitimate chance to allow me to move through a POI without triggering the zeds to wake, and make my Silent Assassin playstyle more effective.
The trade-off for me, is that playing the way I want to play takes copious amounts of time, as I sneak through POIs pretty consistently. But I'm fine with that. I can't clear things quickly (at all) in stealth mode, so I have to be a bit more choosy in which POIs I take on...as it should be. Folks who don't care about stealth can just go full run-and-gun, and wake EVERYTHING UP, blow them all to oblivion with guns galore, and loot probably 3-5 POIs in the time it takes me to loot 1, and I'm okay with that. It's the choice I make when I perk into Stealth, but that's what I want.
So there's no harm in making stealth ACTUALLY viable. There's a speed/time factor that has to be considered for Stealth builds. If a person's going to choose that option, they should be allowed the benefit of being TRULY stealthy.
Just my two cents' worth.