We’ll just all assume that every person who gets this would make themselves early twenties with flawless skin, perfect organs, appendages and functionality, and no excess weight.
My question is, would you change yourself from your genetic baseline, and if so, how?
Lots of changes. Not much on the outside, but fix breakable/broken stuff, be more efficient, this kind of things. Not having to worry about your own body betraying you seems like a good idea.