BatmamAoD

I can understand the argument that it's a form of modification rather than simple "healing" or "regeneration", but it's still taking an organ that either evolved or was designed (depending on the world's/race's mythology) to see, and enabling it to do so; whereas "bespoke" modifications sound like they'd be entirely arbitrary.

...wat? Why is restoring sight to blind eyes equivalent to "bespoke body modification"?

Your last paragraph is part of the premise of Mad Max: Fury Road