Disability is a spectrum. A disability does not have to be so extreme. Tourette's Syndrome is also considered a disability, even though a person with tourette's may not have any physical limitations stopping them from doing anything, the condition still impacts their daily life. Disability is defined as "a physical, mental, cognitive, or developmental condition that impairs, interferes with, or limits a person's ability to engage in certain tasks or actions or participate in typical daily activities and interactions." Stuttering definitely impacts the way PWS live their lives. No, we're not mute, we aren't unable to speak. However we are, at varying degrees, unable to speak fluently. Even if a person gets to the point of being a covert stutterer, or is able to manage their stutter well, that is still a consistent effort on their part to prevent and circumvent stuttering. There's also the non-personal aspects. Social stigma, employment opportunities- don't get the job because your stutter gave the interviewer a bad impression/deemed you unfit for the job? Do coworkers look down on you? Are you treated with condescension, are you patronized? Are you not given as many opportunities to advance in your career? Disability is not just about how you feel about the condition, but how it impacts other parts of your life.