@cstross @irina @davidtheeviloverlord we use LibreOffice for working on clients' Word files when we help them publish. We rarely have any issues with it. 60k words, a few chapter headings, 200 tracked changes? Easy.
But occasionally, we do have issues, and it's always really big, complicated files, with lots of additions like many tracked changes or tables or hundreds of footnotes. So we have to have Word available.