ADS speed/Quickscoping

Pretty much everyone I’ve seen play the game is able to shoot perfect accuracy before they 100% ADS, allowing them to quickscope really fast, but when I try to shoot before completely ADS-ing, nothing happens. I have to wait for the entire animation to finish before I can shoot. And the gun play also just looks really different and clean for other people, almost like a completely different game, while mine looks and feels really slow, clunky, and really jank. I’m on Xbox, I thought that’s what the difference was (maybe dumbing down the physics), but I go on to YouTube to see if other Xbox players have to wait for full ADS, no, absolutely not. I don’t doubt other people have this “issue” as well, but that’s the weird thing, why is it like that? Seems a bit unfair to me. Does anyone know why it’s like this. Thanks in advance.