The point is to not get stuck in semantics, adoption as in jahliya is one thing, raising an orphan as a guardian is another. The term adoption is used because no one has suggested an alternative proper term. lets use the term fostering then perhaps.
the reasons given about raising a na merham at home and all that jazz are there whether you have 'adopted' a child in a jahliya sense or are raising them in an islamic manner.
the issue also is that people just go with a statement like. adoption is not allowed, and then go into issues like mehram and inheritance, and thus give the wrong impression that islam discourages anyone raising an orphan in their home. That paints a rather wrong picture.
I dont have any unislamic practices as far as it comes to the kids, them being adopted is common and public knowledge, my siblings and parents have already gifted their share of inheritance legally to these kids in the event I kick the bucket, and that the kids call me daddy is something discussed and approved by scholars because the kids are too young to understand anything and it has psychological issues if everyone else has a mama and daddy and they dont, as they grow older and as they learn more about the fact that we are not blood relatives, they can choose to call me whatever.
I don't beleive in "BEHAS BARAYAY BEHAS", (argument for the sake of argument).
After reading this post, you sound pretty much same what I am saying and now seem to have good knowledge on the subject. I may have misunderstood your previous post so my apologies.
Regards
RC