The shortest honest answer.

Many nonspeaking people have intact language and a body that won't reliably do what they intend. That gap — between mind and movement — is apraxia, not absence of thought.

Supported typing is a motor accommodation. A trained partner offers physical, postural, or verbal support so the learner can produce text letter by letter. The goal is always to fade the support.

It is in the same family as wheelchair seating for cerebral palsy or eye-gaze keyboards for ALS. The body needs help; the mind doesn't.

"Debunked" is a 30-year-old verdict on a narrow set of 1990s studies. Eye-tracking, fading research, and a generation of independent typists tell a different story.