1. Less Psychological Trauma
Because many adoptive parents who opt for closed adoptions intend to not discriminate the true history of the birth parents to their adopted children, many children develop a sense of incomplete identity.
Children who are unsure of their historical past do not feel particularly grounded in the present. Existent questions of "where did I come from?" and "where do I belong?" eat at them until they feel mild uneasy with the sense of family and home they have.
The child, always knowing where they come from, will be better equipped at making healthy decisions about where they wish to go because they may have a better understanding and sense of self identity. Likewise, birth parents suffer less guilt at the thought of isolating their children and not being actually guaranteed that their child is definitely living a better life than the one they could have given. Although there are always exceptions, and ancestry is not necessarily needed for self actualization, studies have indicated a remarkable difference in quality of mental health in both birth parents and adoptees.
2. On-going Access to Information
Knowledge of and access to medical history regarding illnesses and accidents, access to complete answers about why they were given up instead of psychological trauma that comes from wondering with incomplete information, and any questions ranging from "who do I look like?" to "what physical features might I develop?" will be answered with an ease of access to the source.
3. Less Fear and Insecurity
Adoptive parents tend to be distrustful of the birth parents in closed adoptions because they are unable to properly know or understand the people that they are. The secrecy and lack of communication creates negative feelings about the birth family and the fear that they may try to contact the child and shatter the protective layer the adoptive parents have built so carefully. While from the birth family's perspective, there is fear that comes from not knowing whether the family theyave their child up to was the right choice.
With a healthy relationship between all the people involved, there will be fewer chances of undue insecurity on the part of the child and adoptive parents. Parents will have access to each other, and therefore a larger say and more control in the choice of choosing one another.
Because everything is in the open, there will be no constant, lifelong fear of accidental slip ups or shocking, life changing information regarding the adoption.
4. In the Case of Medical Emergencies
Sometimes unforeseen medical emergencies arise where there is an immediate need for compatible organ or blood donors.
Having prompt access to people who share the same DNA can come in very handy in such moments. Information concerning health issues, or familial medical history being readily available, along with an already developed mutually beneficial relationship with the biological parents or siblings (for organ transplants) is what may be the difference between life and death.
5. More Confidence and Love
When children know that they were not abandoned, just loved enough to have been carefully chosen a better home for, they are definitely more likely to develop a concrete sense of personal familial security that leads to high levels of self confidence.
Also, just having two sets of parents to love and be loved by is a benefit that can not be countered.