I honestly don't understand why I would ever write up or share a Microsoft document.
As for word, it's just fucking rich text format. It's obvious they're manipulating the format to lock down users with less computer knowledge. Otherwise, why is it so fucking complicated?
Markdown accomplishes 90% of what a word doc does and it is legible with or without rendering.
EDIT: If I want data in or out of a spreadsheet program, I'm using CSV.
All of the "special features" of office docs wind up being security nightmares, unusable junk, or both.