Yeah, not sure it can easily be fixed, if at all. The review touches on one of the core problems: the game immerses you and then brutally shatters that immersion in quite a lot of ways.
I've been going off the beaten path now that I'm out of the starting area, just sightseeing, finding, and revisiting areas from the previous games (mostly SoC, which I have easily the most hours in) and this Reddit thread kinda sums up the experience.
Just to add a few stories of my own:
Ended up in the Chemical Plant, walked right in without issues, no word from the guards, no hostility either, until I got to the other side, where the gate guard told me Stalkers weren't allowed in. Of course I already was "in" and wanted "out"... The game just didn't anticipate players coming from that direction (and both sides have roads, not like I jumped a wall or did anything else "weird", like jumping over a fence)
Another one happened today. I found the Military Warehouses and started exploring. Got ambushed by what I believe is a Pseudodog (the one that create clones) and a few Snorks (at least they fought each-other as well). Deal with them and start exploring the otherwise entirely empty place. After checking for hostiles outside I start going inside buildings to start looting. I come across stuff that's clearly intended for later use (doors requiring keycards), so I loot what I can and go back outside.
Only to find three bandits waiting for me that came out of nowhere. So I shoot them, only to get blasted by a bunch of other NPCs from some military faction that also suddenly appeared (presumably alongside the bandits, which they entirely ignored...). So after I deal with those, barely, and I start looting I get a bullet through the head. Turns out snipers had also magically spawned on top of the guard towers...
So I re-load, take out the snipers, and get back to looting, only to get jumped by four Snorks... Kite them into an anomaly, and I finally get to loot without interruption, only to discover that one of the towers that had a sniper doesn't have a way to get up at all, just to shatter any illusion of them getting there organically somehow. (also: bye bye to that loot)
When I did my 1.000 experiment and installed from DVD I couldn't turn everything all the way up without things stuttering (there's some additional sliders under "Advanced" that aren't maxed out even on the highest quality profile). Curious to know whether you managed to max those out without issues (always possible later patches fixed performance)