Jesus Christ OP, please do an excessive amount of research before you adopt. You sound extremely naive.
This isn’t going to be you walk into a hospital, pick up a babe in arms and walk out and live happily ever after with your perfect little baby who will spend their life being indebted to your decision to take them in.
You will be very unlikely to get a little baby and if you do that baby will have had an extremely traumatic start in life, it is statistically very rare that children are willingly given for adoption at birth. If they are it will be due to a court order due to existing issues with the birth parents. This could be a history of neglect and abuse with previous children, substance/alcohol abuse, domestic abuse etc, mental health issues. That will all affect that child and it’s development. A great, great number of children also end up back in the foster care system as something like half of adoptions do not work out.
The reason more people don’t adopt is because it is a very complicated procedure and many do not have the emotional wherewithal to become parents to adoptive children.
An adoptive child is more likely to experience addiction and alcoholism, more likely to leave education before the age of 18, more likely to have a criminal record, mental health issues, developmental delays, attachment issues etc. This is not because of poor parenting from adoptive parents but due to the early childhood trauma they have experienced.
To say you would be prepared there might be trauma and you appreciate this may affect them says you really have very little insight into the care system/adoption process. Adoption is traumatic, removal from the birth family is traumatic, the care system and separation from siblings/grandparents/parents etc is traumatic, entering a stranger’s home and being expected to instantly love them/like them is traumatic. Everything surrounding adoption is interwoven with trauma and that is what puts many parents off adopting.
Consider fostering for a few years before beginning an adoption journey or at least speak with multiple adoptive parents of different ages because this will not be a simple pick a baby up and crack on.
Adoption is a wonderful process when it is successful and I have nothing but respect for people who make the decision to adopt a child it is a dedication that affects all aspects of life in more complicated ways than a biological child would and personally that is not something I could commit to already having children in the house.
Your approach to this hasn’t settled well with me, it’s coming across quite pious.
‘Why don’t more people adopt?’ Why don’t you want an eleven year old who experienced infant drug withdrawal, extreme developmental delays and is undergoing therapy and anger management whilst trying to maintain a relationship with four siblings from whom they have been separated? That is a more accurate depiction of children sitting in foster care needing to be adopted.