Absolutely true! Um, except a Fallout game with complex quests and dialogue, no randomly generated areas, set in a wild west casino town, has absolutely nothing to do with Stalker. Oh and did you get the memo? Stalker didn't invent the FPS-RPG hybrid genre.
Stalker was an RPG?
I took Stalker as an example because it also features a destroyed world. It's basically a FPS, and Fallout without VATS is also basically a FPS (combat wise).
More than most FPS's, but not really. Still that makes them even less alike.
Purely combat-wise? Well, sure. Personally I'd prefer a Deus Ex combat system, though that's not even too different to Stalker's. Would it even be a bad thing if the combat was like Stalker's - FPS in a desert?
I doubt Obsid will overhaul combat (besides a melee spruce up) and that's fine - story, dialogue and atmosphere are what matter.