Linux

Libreoffice is strongest when you're using ODT format because it's an open standard. It's not at all their fault for docx incompatibilities because they change the format CONSTANTLY and of course their only documentation is internal.

Personally I haven't had those issues though, only slight formatting differences when opening docx files, and half the time it's because I didn't have the font installed. You can change to the ribbon style if you really want but personally I prefer the older style, I find it's easier to find what I want.

No issues as long as you switch the toolbar to use tabs or contextual groups instead of the insane button overload which is still the default for some reason.

I use Word at work and OnlyOffice and it works perfectly fine for my needs.

I don’t see any reason to go back to any proprietary software at home 😇

If you need MS office compatibility, don't use Libreoffice. If you just want to use the software for your own documents, Libreoffice is (imo) better* once you get used to it. If you need Basic Excel macros, Libreoffice won't work unfortunately.

(*) the thing I hate about excel is that everything works "like magic" which is fine as long as it works. When something doesn't work, you are screwed because you cannot explicitly tell Excel what to do. It wants to do its own magic instead of obeying your will.

This is another state, last one was Munich