@danmcd It's not about exporting docx—LibreOffice has been fine in that respect for over a decade—but about interoperating with tracked changes and notes in big files emitted by Word, and not corrupting the docx file. As of my last set of copy edits to a novel (two months ago) the answer is conditionally, "yes". (As I just got the page proofs back for checking …)
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@davidgerard @danmcd I can't be arsed devoting brain cells to Microsoft any more these days. Here's what I had to say in 2013, and the only thing that's really changed is they added an LLM and somehow made it *worse*: https://www.antipope.org/charlie/blog-static/2013/10/why-microsoft-word-must-die.html