It's not about whether the person is "a success" or "a failure", it's about whether the person feels that their condition is materially impacting their daily li

It's not about whether the person is "a success" or "a failure", it's about whether the person feels that their condition is materially impacting their daily life. If I feel that my gaming habit is impacting my job because I can't resist playing games during work hours, that can be classified as a disorder. It's just shorthand for "this is something we'd like to fix".