Bionics. In the show, The Expanse there's a scene where a guy who had his arm cut off in a space accident is trying to get his company to not cheap out and to pay for a bionic arm replacement instead of regrowing him a new arm. The bionic arm being greatly more superior than a normal arm.
Lately, robotics and prostheses are becoming so advanced I can see this as happening to where people will eventually want artificial designer parts over their own.
We had quite the discussion at work about this very scene (I am loosely related to OSHA stuff), at some point people might think of deliberately having work "accidents" so the employer has to pay for superior replacement parts. And then have an advantage on the job market because of this. Same could go for sports.
I guess technologically, we are very close, but might need to work on the whole ethics part a bit more?
Having said that, I would not mind some advanced Kiroshis to replace my screwed up eyeballs.
Surely it would work like a car warranty, where a certain level is free and you would have to pay extra for the good stuff. For example, you lose your arm in a work accident, company replaces your lost arm with arm-replacelement-mk1-TM which is equivalent-ish to a regular human arm. However, if you want top of the line arm it will cost extra and company will just pay for surgery and base arm replacement, you must cover the difference. You want anything other than the Honda civic of arms? Gotta pay that premium baby! Otherwise embrace the beige mediocraty life.
This assumption is made based off of current prosthetics. What if future prosthetics are near-nonidentifiable from real ones? Maybe we're even about to get our real skin to grow over the outside.