I agree with spookyrachel. I think sending an adopted child to boarding school is a terrible idea.
Lots of things about the comments are troubling to me, IMHO...
If a child asked to go...
They might ask but it still would not necessarily be in their best interests. We rarely make decisions for kids on what they want exclusively.
It's easy to imagine a child could pick up that this might be what you want and so request it.
OP you do seem quite 'fixed' on the idea that boarding school could be good. That is how it is coming accross to me.
I have a few friends who sent their kids to boarding school. They had their reasons and it worked (I think) for them.
But I think for the majority of kids it is not a good idea and for the vast majority of kids who joined their family by adoption it is not a good idea.
The comments about a longer school day don't map with the reality of how many children struggle with the school day.
The drip drip of positive comments must be tempered with the potential drip drip of negative comments from class mates and maybe even teachers.
Plus not seeing mum/dad at the end of the school day, to discuss those comments/concerns with, sounds dangerous. Who will affirm a troubled child in the night?
Plus I think it is better for kids to learn to identify their own achievements and be able to praise themselves. They don't get to be able to do this all by themselves (ironically). Will boarding school staff really have the time and inclination to nurture each and every child as much as a parent does?
The adopted child who thrives in boarding school will be the exception not the general. Why would you just incidentally happen to adopt the child who is an exception when you are already thinking about this?
Sorry if that sounds harsh but my gut feeling (very sorry if I am wrong) is you feel being able to send your adopted child to boarding school you will somehow have achieved the almost impossible, done such a good job of raising them they thrive on boarding school. I think your friends have sort of turned your head with their 'assumed' success.
I am very sorry if this is not the case but that is how it feels to me,.perhaps for good reasons to you, maybe noble reasons, but I think your logic is skewed. Sorry. All the best however things turn out. 