Are the "pictures under glass" interfaces critiqued in the article really any better for those who cannot use their hands? I have full use of my hands, so I am

Are the "pictures under glass" interfaces critiqued in the article really any better for those who cannot use their hands? I have full use of my hands, so I am not sure, but the few people I know with limited hand control use some specialized input device that they can operate with their mouth, eyes, or head.