People are usually approved for either fostering, or adoption, not both. A few people feel able to apply to be concurrent carers, which gives them that dual approval, and the idea behind concurrent care is indeed that they foster the child and if the child becomes avaialble for adoption, then they will become the adoptive parents. The vast majority of people who wish to adopt are not concurrent carers, but are approved for adoption only - for many reasons but among them the legal risk inherent with only fostering a child, and all the other ways concurrent care is different (eg. contact with birth family etc)
The law in this country says that no mother can give an LA authority to place her baby for adoption, before at least 6 weeks has passed. That means that the baby cannot be living with anyone who is solely approved for adoption, they have to be placed with an approved foster carer or a concurrent carer with dual approval.
When the birth parents don't consent to adoption, it also says that no LA can place a child with people approved solely for adoption until they have a placement order. It takes months to get a PO, that's just how it is. So again, child has to live with foster carer or concurrent carer during that time.
So concurrent caring is the only way a baby can be placed with the people who will go on to adopt him/her. We don't have that many people willing to be concurrent carers, but where we do, it's already possible and happens. There are people on MN whose adopted children came to them as foster children through concurrent care.
Is it a bereavement for a child to be placed at 9 months? Absolutely it is, it's very traumatic for children to be moved. You don't want to hear your just turned 2 year old screaming unconsolably in grief for their loss, for hours and hours and hours, and parent them through the weeks and months when they are processing this bereavement, like I have. But in the system we have, it's really not that common for a case to be suitable for a concurrent planning arrangement. Where it is, we have the mechanisms in place to be able to do it.