I think in cases of people with Alzheimer’s or other elderly people who can’t really operate things besides play/stop/next dumb screen isn’t going to work. Mostly because you have to hook up something else that will require additional steps to operate.
My father doesn’t have any serious dementia or signs of Alzheimer’s - he is 65 but typing in anything on keyboard is still a major hassle for him. If he could have play/stop/next button it would work for him.