This is how transhuman upgrades will really begin. Repairs refined to the point of invisibility and advantage over the average.

Doctors will eventually have to ask themselves if an upgrade is identical to a repair in terms of application requirements then why not opt for the upgrade for the same reasons you deploy a vaccine?
The logic of the vaccine will be the foundation of creeping upgrades because it a treatment for a condition is known to be safe and also prevents injury by granting some practical asset, then how is failing to offer it not harmful?
This is also how immortality will arrive. Not as a magic injection, but as a series of germ line edits designed individually to prevent known pathologies, but which collectively add years of life.
When we think about making a gene edit we are making something the body does anyway more efficient. Those increases in efficiency will not just cure the issue at hand but will also add both quality and quantity of life.
However, this progress will be seriously limited until we have a single payer medical system whose primary purpose isn’t wealth extortion.