My best friend went to boarding school from the age of eight and her parents were internationally based, so she it was full boarding and she would often go to friends for exeat.
She is possibly the nicest, most socially capable person I ever met - she gets on with anyone and everyone, and has a great career.
Up to that point boarding was just a brilliant thing for on paper (despite the few years of bullying and homesickness) however the problems were evident from the moment she had children, she had and still has absolutely no idea how to parent. None at all.
She goes from being too strict to being too slack in less then ten minutes, she hasn't been able to form a proper bond with either dc, as she simply does not know how to. In the end, she got a nanny because it was easier and better for dc, and went back to work, and worked every hour so she could avoid dealing with them herself. I think they made her feel inadequate.
When she is with them, she spends every minute doing 'activities' with them, as that is all she knows. Holiday clubs are a must and are used for the maximum amount of time. It is sad for her and for dc. She also keeps secrets, and never lets on when she has any problems - everything is always 'fine' until its not. Her marriage ended because she was too cold and distant according to him, and to be fair she was not bothered when it did. It is like part of her has failed to grow properly.
So yes the problems were not immediately obvious, I had known her twenty five years before the first became apparent. She said she hated boarding when we were young, but now has rewritten the past to something she loved and her parents did for her as a gift, it is strange. She was abused at school and it was pretty bad by any standards, but still a leading school of course, and thats all that matters.
Her dc are now going to have the same fate, as she can't cope with them, they are out of control teens now and they are going to be packed off asap.
I think there is a 'boarding school cycle' that is almost impossible to break, because where on earth do you learn to parent if you are not parented yourself?