Your right that in principle somatic gene engineering is probably harder (especially once you consider the complexity of human maturation means that some things are hard to change)
I would not discount it, however
you have 15-20 years of time between germline engineering and an adult person, and in that time somatic engineering has time to catch up, and another 60-80 years after that if you are lucky before that person would die with current lifespans. In those 80-100 years, somatic engineering can catch up, and allow for revectoring
I am fairly certain that it is likely that people will be doing both. If you really bottle germline, but get a functional result with something unacceptable like 20 year fatal cancer risks at 70-90% (unlikely but possible), somatic can get a second bite at the apple.
Doing things that would cut that off might be unwise/unethical.
Your right that in principle somatic gene engineering is probably harder (especially once you consider the complexity of human maturation means that some things are hard to change)
I would not discount it, however
you have 15-20 years of time between germline engineering and an adult person, and in that time somatic engineering has time to catch up, and another 60-80 years after that if you are lucky before that person would die with current lifespans. In those 80-100 years, somatic engineering can catch up, and allow for revectoring
I am fairly certain that it is likely that people will be doing both. If you really bottle germline, but get a functional result with something unacceptable like 20 year fatal cancer risks at 70-90% (unlikely but possible), somatic can get a second bite at the apple.
Doing things that would cut that off might be unwise/unethical.