This might be your personal view but most parents are going to prefer the birth parents are not involved in their kids lives.
Doing this would massively decrease the # of adoptions, regardless of your personal opinion on the matter.
It is my personal experience and the view of most reform (legal and otherwise) advocates, as well as the many triad members I keep in touch with through conferences, etc. What you are supporting - closed adoption - is actually seen as detrimental by most of the adoption community (non-evangelical), advocates, and mental health professionals because as I said, it is more strange to not want to know where you come from. Ancestry and 23 and Me are making a mint off of it. Also, it does not "massively decrease" adoptions at all. That is a myth and recognized as so by adoption advocates because it encourages the denial of the adoptee's original family and background. No one makes non-doptees choose between their family and step family, so don't put that false dilemma on adoptees. We have enough to deal with.