I think what is really needed are apps designed specifically for disabled person. To require every approved app to be easily accessible to disabled person is technologically backward. In reality it limits the functionality of apps.
US is becoming crazy nation. How much can a blind person use a smartphone? How much can external organization dictate a company to design its product? If iPhone is a monopoly, this may make some sense. But but Google Android is dominating Apple iOS. Isn't this a fact by all kinds of media reports?