first of all, I don't think alien isolation is a zero combat game. you get weapons and gadgets and stuff and there are things you fight against. I've seen videos where you get a gun, FPS style, and friggin shoot a synthetic man, and then throw a bomb at him and light him on fire. It's already well beyond Outlast.
second of all, Outlast sucked shit. I hate Outlast. I hate Outlast deeply. I don't hate the people who made Outlast, and I recognize their skill and talent, but the game design is BROKEN. it's FLAWED. A game like this brings tension from a FIGHT or FLIGHT decision. A choice. Should I try to fight? Maybe this will be a hard fight, or maybe I don't have enough ammo, maybe I should run instead. This choice -- This is the SOURCE of fear and suspense. A game like Outlast is just a carnival ride. It's scary for a bit, but after you realize there's nothing to it and the outcome of everything is the same and there are no actual choices, it becomes a boring, pointless, routine snore. The scares were 100% gone for me by hour 2. 100%.