I could not agree more on the last two paragraphs. Let's use XML were it makes sense, not try to force everything to look like XML.

A "native" XML data type built into the core Perl6 doesn't really make sense. It's best left for a module. Maybe one that's part of the base installation, but a module anyway. Or rather several modules providing different datatypes, different ways to look at XML and structured data generally. Let's not prevent improvement, by putting too much in the core.