Oh sorry, I don't at all intend to say you should write your own parser! Totally agree: "Don't roll your own XML implementation"
What I was addressing is, interfacing with an XML parser and converting that into whatever your internal representation is, can be a chore. LLMs are great at that stuff.
I'm going to stand by my position there, if you're writing an application that's primary technical purpose is to communicate via an XML based protocol and feel the need to outsource the XML part to the bullshit machine, IMO you probably shouldn't be writing that application.
To each their own.