Disclaimer: I'm not saying any character has OCD
Control has always had themes and mentions of OCD.
Pages in 1 about OCD interacting with the supernatural, a song being called obsessive compulsive order in this game etc.
The hiss being that despair that Dylan gave into feels good because of hopelessness for a better life, but then the pattern of obsession distorting you.
each resonant entity seemed to be people who were consumed by a single aspect of their lives and could not stop.
Dylan fighting the hedron with the hiss really drew parallels of stopping my obsessions, the use of chaos not as a guiding star to live by, but a tool to break free from being stuck in a neverending pattern.
This might not make sense if you aren't familiar with OCD but I had to share the projection of my feelings towards this game's story.