Auto-aim in the classic games allows for very precise shots, so I'm not sure what you're talking about there. As for "bad controls", I'm going to assume you're referring to Tank Controls. First off, Tank Controls aren't bad if the game is built around them (all Classic RE's were), and second, many games show it's possible to have both fixed camera angles, and standard analog controls that work just fine.
Beyond all of that, fixed camera angles add more to the experience than you realize. For instance, scale. Did you notice how much smaller environments like the Baker estate from RE7 or mansion from Lost in Nightmares felt compared to, say, REmake's mansion? It's because in REmake, the camera is pulled further away from your character, making the environment feel much larger than it actually is. I don't see how it's possible to impart that same sense of scale with the small main hall or narrow corridors of RE2's police station with a third-person camera, nor do I imagine it would work well at all with the latter. It also utterly deflated the tension of not knowing what's ahead of you, when you can simply see to the end of a hallway with a standard camera.
A third-person camera also makes it more difficult to dodge enemies. Classic RE games are built around avoiding enemies rather than fighting them when at all possible, and the fixed camera angles greatly facilitate this. Assuming the camera is similar to RE4, Dead Space, etc. (very close to the player to impart a sense of claustrophobia and greater immersion), it will make running around even standard zombies very difficult unless the game is set in very open areas (which most of RE2 is not). The fixed camera angles absolutely help in this regard, giving you a bird's-eye view of every room, and making it easier to find a route past enemies, rather than through them. These are just some of the contributions fixed camera angles can bring to a Horror game.
