The tendency people have to assume the DSM has unerring authority is so so troubling to me. It was originally a loose handbook of statistical trends and symptoms that tend to cluster together, and that's what it is to this very day, it just has a lot more pomp associated with it because interpreting it and divining wisdom from it has become a cottage industry and because insurers have decided to take it as gospel. We can't even safely assume that a named disorder in the DSM is a real thing, so much as reflection of the prevailing biases of the time in which it was written.