"also i don't think many adopters would be willing to do daily contact with the birth parents sometimes in there homes" but they're not required to in this country on the whole so you can't say that - most adoptive parents are desperate to do what is required of them and if it were required I suspect they would.
I know foster/adopters through concurrent planning who have effectively done it; I spent a couple of months visiting DS daily, twice a day for two hours each time with a 30 min drive there and back each time, it took the whole day every day (except Sunday when I only did one visit) for two months. I did it because I didn't have any choice and I would do it again in a blink if I could.
"The reason why children are in foster care for so long is not to stabilise them" - yes I know that but the question was should children be left at foster carers to stabilise them in preference to placement with adoptive parents. And (as I said originally) it really depends on the child and the specific experience and ability of the foster carers.
IME adoptive parents cope fairly well with all manner of issues and delaying the point at which they learn to cope with those issues together with their child is in my opinion counter productive unless there can be a clear benefit shown for the child.
I think its a bit irrelevant because the provision of foster care is more hit and miss (from my understanding) than conscious planning ie not so much "we need a foster carer with this specific skill" than "who is available now. There aren't enough resources in the system to be choosing the perfect option just the available one in most cases. There was a report done in 2010 following the sharp increase in the number of children fostered after Baby P case and two thirds of fostering services said they were "asking foster carers to look after children outside of their approval status often without formal recognition of this change". They also acknowledged that more had to be done to ensure that foster carers had the skills needed to cope with the needs of the chidlren in their care.
The report states:
"Without substantial investment and increases in resources, children are going to continue to be placed with families that do not fully meet their needs, putting a strain on the foster family, the child and the relationships, and increasing the risk of placements failing."
When considering whether children should have a planned period of time in care to "stabilise", I don't think you can rely on foster carers having any special insight, experience or training to deal with these children even if in your specific case you did.