OOXML is a terrible format, significantly overcomplicated and implemented by MS Office in such a way as to make alternative implementations fully compatible with it impossible. It's "open" in the name only, burying it would be the only logical step if wide interoperability and using truly open formats is your real goal.

And Italo's bad marketing strategy will only ensure OOXML wins. That's what you're missing, it's just a bad way to make the case or foster change.