I feel like the worst thing about severe OCD would be, not just the disruption that comes from all severe mental disorders, but the banality of it.
Like this guy said, he wasted his life ... by cleaning stuff. It's basically Sisyphean, being condemned to spend your life in labor that you cannot actually ever finish, benefit from or retire from. To me that's in its own tier along with things like severe agoraphobia. You're basically healthy, except for this one paralyzing fear that makes you just watch other people and long for something you can't have. But you appear healthy to everyone else, you're not hallucinating or spouting the craziest shit, but inside you may as well be.