The problem is that it’s not really about when things go well - a baby is born and everyone is happy. Is it that simple?
Because, with reproductive technology, the ramifications of things going wrong are so severe that they need serious consideration at the legislative and regulatory stage.
Also where is the end point at which the success or happy outcome of a donation is judged? Is it when the baby is born? Is it when the donor has successfully completed her own family? Is it when the baby grows up and does or doesn’t seek contact as an adult? Is it when they begin to consider the genetic inheritance of their own children?
I am not saying that it shouldn’t happen (I considered doing it myself, as per my first post, but I thank my lucky stars that I never pursued it!) but I am saying that gamete donation is a weighty undertaking as the consequences might only be felt years or decades from now. And very young people, I would suggest, are less able to make those imaginative leaps or fully grasp the significance of what they are doing.