I feel like it's incredibly difficult to make a horror film whose central goal is an analysis of the trauma of one character. In order to pull that off it requires a complete synchronicity of form and intent. Most attempts at this end up somewhere in the vicinity of broad drama.

These films also put an incredible amount of stress on the actor to carry more of the load, because they are the horror scenario. If the director is not adding to the performance by being there with their images & their form then the actor is left to drown in an ocean of realism

Consider two examples where it does work: in Repulsion (1965) and Twin Peaks. Both of these films are about a loss of agency and how characters attempt to live with horror. Both of these images depict the entire trauma of the central character in one frame.

These images are deliberate, have a thematic weight of their own even when removed from the context of their movies, and give reasoning as to why these characters are the way they are.

These images add to the performance of the actor, because the director is catching them like a trust fall with the form. That in turn allows the actor to feel comfortable to go to heavier places as a performer in order to unleash the psychological torment of the character.

This is not at all easy to accomplish, and yet, it has become one of the go-to modes of storytelling when considering modern horror filmmaking resulting in a lot of ambient tones, watered down Shirley Jackson-isms, obvious Kubrick homage, and heavy-handed drama.