"It took a lot of work, but LibreOffice 7.6.4 can now open a wide range of word processor documents from pre-1994 on both Windows and Mac machines."
"Can it edit .docx files without screwing up formatting yet?"
"No, but who uses THAT?"
Many many years ago I was distributing my resume as MSWord documents that I had so nicely crafted in LibreOffice. Years later I happened to open one of those resumes in actual Word and realized all my careful formatting was completely trashed.
It's not just between LibreOffice and Word. Up until at least Office 2016, .docx formatting would regularly break for me between Word versions or between Office for Windows/Mac. Admittedly, Microsoft has got better with this as of late, but the .odt format is much more solid.