> Why should I care that Microsoft Office has more users than LibreOffice?
Because people are going to send you documents in Word format, and expect you to be able to send them documents in Word format. Including embedded objects, RTL text, animations, and many other features that LibreOffice barely support and do not transfer well between its own native format and the Word format.
I'm sure it's a problem for some. But at my company we've been using open/libreoffice for about 20 years and I can count on one hand the times it has actually been a problem.
And all our customers often send us MS Office documents. They never use the fancy features.
