It does serve a purpose. There are spots in the game where the player is stuck inside of an object and uses the mechanic to slowly open doors to prevent getting insanity or alerting a monster. You don't think it serves a worthy purpose is what you're saying. I don't really agree but either way, it's there for a reason.
Actually, what I had said was not "there is no point" but "unless there is a point."
Again, having played it for only 30 minutes or so I saw no point. I was curious as to whether there was a point. I still think it's overly complicated if it doesn't come into play often, and I think it turns what's already a niche title into a very niche title without particularly adding much use.
Let's be fair here: a good amount of people are complaining about the mechanic here. A good amount of us that perhaps would have been sales but, given time in the demo and seeing something appear overly complicated without a need for it. The demo should have either displayed the use or the game should give the option of binding a button to opening and closing doors for when you don't want to swing the mouse. The latter is probably the best way, as it would have made the game more accessible without dumbing it down.