Well said @Bellyblueboy. It does undermine posters' arguments a bit when the sneering, passive-aggressiveness or name-calling is the main takeaway from a post.
I had an ex-boyfriend who was very clearly damaged from his boarding school experience (famous, well thought-of school). On the other hand, I have friends who had what seemed like a much healthier experience, with regular family contact and strong friendships as a result.
I think it's worth highlighting that he peers of people.on this board (maybe aged 30-50) would have been much more likely to have had a very different boarding school experience than a lot of kids boarding in the UK today.
My kids are only 7 and 10 but I can already see that one of them would be much more likely to benefit from something like a flexi boarding arrangement at a smallish, nurturing, arts-focused school, which my other child would by hysterical at the idea and would also be much better suited to a more rigorous STEM-focused environment. Kids are different.
The reality is that they're both at smallish local state schools that don't have great Ofsted ratings but at which they're both very happy. Their schools aren't perfect but we all make choices and we all adapt to our circumstances as best we can. (Who's to say what I'd choose if I had the choices available to families with a lot more money? )