Oh, I finished it already and got the true ending.

Just like Stalker 1, it pays to not blindly run at quest markers and make up your own mind.

The game is a treat, but struggles to run on many systems, so my recommendation is the following:

FSR 3.1: Quality (66% resolution scale)

Frame Generation: On

AMD Fluid Motion Frames 2: On

1440p Epic on a 7900XTX averages 60 FPS in busy towns like Rostok.

60 FPS Native -> 120 FPS FSR 3.1 -> 240 FPS AFMF

I've got a 240 Hz OLED (for the dark scenes), and the total video draw latency with all of that is 3.11 ms.