Drawbacks not mentioned:
Growing movement to identify sperm donors.
Two people with dubious ethics raising a child.
The danger of having a child with a half-sibling or other close relative is now minimized by the nationwide status of the cryobanks. They used to be local, but now the stuff is frozen and shipped by FedEx Overnight, so the chances are slimmer.
Adoption of older children is now more acceptable with the growth of Internet support groups. These people become very close through daily discussion of their shared problems. That is the real need: for older children to be given permanent homes, so they don’t have the sword of separation hanging over their head.
Some good thoughts, thanks.