In a way, large changes that make the embryo completely unviable would be less bad: the embryo would be wasted, but at least you wouldn't have caused someone a

In a way, large changes that make the embryo completely unviable would be less bad: the embryo would be wasted, but at least you wouldn't have caused someone a lifetime of genetic disease. The worst case scenario would be a viable but badly diseased embryo. I wonder if they can tell which of these outcomes they got from the experiment.