Never attribute malice where incompetence is a sufficient explanation.

Microsoft isn't intentionally obfuscating the docx. Docx is a shit-show because hundreds upon hundreds of Microsoft business initiatives, executive pet projects, and ancient compatibility rules have all collided to make a giant pile of dung.

If LibreOffice is worried about what docx does to their productivity ... you should see the fucking engineers lamenting INSIDE Microsoft about what it does to their friggin productivity.

This horseshit isn't anyone's plan. This horseshit is an emergent phenomenon like a fucking termite hill in your back yard ... where no single termite is responsible or knoweldgeable, but all of them together made a pile that breaks your lawnmower.