The first study is a survey of surgeons, which seems rather useless. What warrants the assumptions that they would learn about the long term outcomes of their surgeries?

The second claims to have looked into several studies, which might include ones like the first one. Would be nice to have an actually useful direct study, especially for young people.

As for cosmetic surgery, you brought that up. I don't think it is as worrying, as many of them are reversible, and they don't sterilize the recipients. Somebody regretting to get a nose job is hardly in the same category as someone regretting they cut off their penis.