I think the last part is probably the biggest thing holding them back IMO... I tend not to install MS Office products on my personal devices, I haven't run Windows on a personal device in a few years. I've mostly maintained just my resume in word or libre-office format for well over a decade. I can't tell you how many times the LO format lost formatting, or just messed up between version upgrades. Same goes for opening a word version in LO.

That doesn't count the various times where it behaved weird, inconsistently had fields/tables that were impossible to edit, etc. I've had to completely recreate everything a couple times over the years. That's just one document, for one guy that I don't really touch that often.

Say what you will about Firefox vs Chrome in terms of usability, compared to MS Word using LibreOffice is worse than early betas of Netscape Navigator 4.0. It's both impressive and upsetting. OnlyOffice at least looks nicer, even if it doesn't really function any better. MS's online version of Word in the browser operates more consistently than either.

Have you tried setting MSWord's default save format to Strict OOXML for inter-operation with LibreOffice?