Not at all. It's actually a purely practical (egoistical) perspective. I am not in a position to use MS Office, so I want to be able to use LibreOffice without headaches. If everybody uses MS OOXML, and only MS Office supports that perfectly, I'm going to be in trouble for using LibreOffice.
It would be even better for me to be able to say "sorry, I can't open docx files, please save it as odt", than always having to warn people that my changes might screw up the document.