I used XSLT as a build system for websites way back in 1999–2000. The developer ergonomics were terrible. Looking at the example given, it doesn’t seem like anything much has changed.

Has there been any progress on making this into something developers would actually like to use? As far as I can tell, it’s only ever used in situations where it’s a last resort, such as making Atom/RSS feeds viewable in browsers that don’t support them.