So, I'm finally running through S.T.A.L.K.E.R. 2. I played a bit at launch but took a break to allow for some patches.
I knew from back then that I shouldn't expect roaming packs of stuff or persistent NPC AI across the map. Fine. Got ambushed by a lot of random Military, I bore witness to random Bandits getting wiped by a huge gang of Snorks with both having spawned directly behind a truck garage - it was really funny to watch, though, not as funny to mop up the dozen Snorks...
But the thing which stung the most happened just now. I've been cutting the South-Western corner of The Cage at the Cement Plant to get to the region's South-Eastern corner to explore it. I knew I had the Machine Tractor Station at my 2 o'clock, and that's where the aforementioned Snork bonanza occurred, after it greeted me with 6 Bandits and two Bloodsuckers when I first got there.
As I exited the building site perimeter, I ran into a group of Loners coming from the South-ish. My mind instantly thought: "oh, that means the Tractor Station's clear, otherwise these peeps would've been loot fodder for the return trip." And I immediately realised that, no, it only means that they may have spawned behind the perimeter wall, out of my sight line.
And now I have to sneak through a ditch because I don't want more Bloodsuckers.
Update: decided to double-back through the Tractor Station when returning to the Factory (no way I'm going in a train depot with a Seva-D, thanks!), and, of course, killed 6 Bandits, got my ass chased away by two Bloodsuckers as I finished looting, which were ambushed by a dozen Snorks as I was booking it toward The Cage. Of course!