Being black is not an objective deficiency. Not having one of the five senses is.
Don’t get me wrong, I recognize that there is a strong deaf culture that has formed to support people who have hearing disability, but if there was a 100% effective, safe and painless pill that restored hearing loss in all cases, 98% of the deaf population would be hearing within a month. You’d have a few outliers whose self-esteem was so tied up in their deaf cultural identity that they would refuse to change, but the vast majority would want that other sensory input.