The entire nature of the field of psychology and mental health treatment is relative to pain and dysfunction.

If people fit in well and didn’t have issues (either internal pain/suffering or society interaction pain/suffering), they are not applicable to the field.

This is key and what makes something a disorder.

Everyone experiences some obsession or compulsion. But only some experience it to the degree of a disorder.

Just like everyone has some “autistic” tendencies. But it is only a disorder in some.