Ethical constraints still depend only on scientists’ restraint — a “thin reed to stand on.”
Darwinian evolution and intelligent design are competing theories of biological origins, but they are more than that.
After going through the appearance of hand-wringing, I wouldn’t expect much of a problem if scientists said they really wanted to proceed.
Why does the evolution debate matter so intensely?
The successful births came from DNA taken from fetal, not adult, cells. That is the usual course in this research.