While it’s possibly to make documents that work correctly in both editors with this formatting, you’re simply not going to get people out of their flow. It’s received as well as if the legal team started telling you what your Vim config should be ;).
It ends up being cheaper in terms of time saved for everyone to just buy office. I have a copy of Office just for Word based legal interactions and Excel and use LibreOffice for everything else out of preference for the “old school” UI.
Basically unusable if the docs have to be shared back with MS Office users.
Some time ago (shortly after MSO2016 for Mac release), I had to fill in a certain document, which I did and returned. Except it wasn't filled correctly, because Word 2016 for Mac didn't support the form controls, the document used them and I had no idea about that.
The other party called, we met, compared what we have both seen on the screen, corrected the document and closed that with "word acting funny for whatever reason" (the other party used 2013 for Windows). If I was using LibreOffice and something similar would happen, despite that they do a great job, the blame would be distributed in another fashion.
Fast forward several months and I see in the monthly update release notes, that the forms feature was added to the Mac release.