P.S. Google has a bazillion dollars but can't figure out how to maintain a new secure XSLT library or update to a newer one which exists already? The usage argument is dumb…maybe a lot more sites would find good uses for XML/XSLT if this stuff was actually maintained and promoted properly!

Why would Google want to bother? Who actually uses XSLT today for making webpages? Why should browsers spend effort on supporting XML+XSLT-based pages in addition to HTML+CSS-based pages?