1. Track changes is 10 times easier in Word.
2. Auto correct works infinitely better in Word.
3. Formatting doesn't translate well. Sure, if you've got plain text, you're fine. Add some formatting, though, and you'll have page breaks in all sorts of odd places.
Then there's Excel, which is far, far easier to use than the Libre version. Sometimes it's the little things, like hitting enter and having the selected box move not just down a line but back to the left when you're entering multiple columns and rows of data. Sometimes it's the ease of sorting. Libre Office is pitiful in comparison. Oh, and Libre Office has terrible xls and xlsx compatibility. Basic files had ruined formatting.
Libre Office is ready for prime time for people who don't actually get work done with Office. I'm sure your religious dragging of people away from Office has ended with more than a couple people silently cursing your name every second they do work. But hey, what's an extra thousand clicks a day, right? Every day, for years.