I don't know why you are downvoted, while you state correct viewpoint IMHO. The accessibility is not just about screen-reading but also options that make our contact with the virtual product be more pleasant (e.g. resizeable UI, non-transparent background under subtitles). There are also many indie, slow-paced games that do not have any kind of voice-acting (well, most of tycoons), where even Windows Narrator will be enough. Please note, you don't have to be a blind person to use assistive software - there are a lot of people wearing a corrective glasses, who might use some screen reader.