Currently, yes, it's only really feasable for embryos. But there are instances of biohackers using gene therapy to do interesting things. For example a guy cure

Currently, yes, it's only really feasable for embryos. But there are instances of biohackers using gene therapy to do interesting things. For example a guy cured his lactose intolerancy temporarily by gene therapy: https://hackaday.com/2018/02/14/biohacking-lactose-intolerance/ https://hackaday.com/2018/02/14/biohacking-lactose-intoleran.... Basically what I'm trying to say is that you don't need to reach all cells to cure something. You only need to reach the relevant cells.