I agree with almost everything you said. I have this theory that RE4 was in a unique position where games from that era, no matter how polished, still gave the player plenty of leeway to use any technical shortcomings to their advantage in a fun way. The door thing you mentioned for example. In the original it looked so goofy, it was almost like an unintended yet lucky accident. But it was one of many things that made the gameplay so incredibly fun. It felt like there were tons and tons of ways to fight through every encounter whether it was a respectable course of action or not. Something completely absent from most games today since developpers are far too obsessed with things being realistically sound instead of being fun.
Halo 2 always being my go-to example for this. Game wouldn't have been half the success that it was if it didn't have janky pshysics, button combo's, a lack of death barriers etc.
Anyway, In the first 10 minutes of the demo alone I felt very constrained. Sections being cut-off from backtracking, a scarce amount of collectibles, enemies feeling very scripted in terms of combat and animations. The fucking dog is dead?? And I mentioned this in a previous post but the game won't allow you to go to the upper floor of the clock tower anymore. That was one of my favorite cheese spots in new game+
Game looks good though, I'll give it that.
Edit: Oh, and your knife being able to break now. What on earth.