I think for the MS Office thing, it depends on what it’s being used for. If it’s just creating a fresh document or editing a simple existing docx, LibreOffice it totally fine; I’ve heavily exclusively used LibreOffice Writer during my time in college and been okay, as I’m either just writing in MLA or using a provided Word file that I can then just save as an ODT after initial conversion and export as a PDF when it comes time to turn it in.
However, from what I can tell, if you’re working in an organization that extensively uses MS Office, files may need to survive multiple openings and edits between multiple editors, and multiple cycles of translating between document representations can lead to degraded documents and just make your work life absolutely miserable. Thus, LibreOffice isn’t an option, though I hear there are more MS-compatible suites that are usable on Linux, though not all of them FOSS.
This is why I’ve so far left my mother alone about Linux; maybe if I saw some evidence that her workflow would be more amenable to LibreOffice than I think it is, I’d reconsider.