Stalker is an immersive sim. None of them are procedurally generated and they all have a lot of attention devoted to a narrative.
Actually Stalker: SoC has only a barebones plot smaller than 2-3 side quest chains in some Fallout 2 or Arcanum. I beat it 3 times or so. Later CoP got a more "cinematic" plot but the game lost much by it in my opinion. I'd even go on a limb here to say Clear Sky was better, despite all the faults.
The SoC side quests are so bad they could be procedurally generated with no significant effort or original research. Have you played the game?
if Arcanum were first person [...]
Apparently your point is that a VtM game would gain by being an "immersive sim", in lieu of more traditional RPG elements? I don't see you backing it up with any analysis, but I could be wrong–this thread is 20 pages after all. In the end, it's a claim for you to try to prove rather than for others to try to disprove from the get-go.