I’m sharing Page 1 here of my quarterly “professional” document (a.k.a. published newsletter) for your perusal. I used LIbreOffice on Mint with a 99 dollar laptop. Note bottom left, I got an ISSN for it. It was only an 8 pager this quarter. (If anyone wants the full issue, it is 7 bucks this issue or 25 bucks for a yearly subscription.)
For citations, didn’t there used to be free web sites generate them in APA or MLA format? Copy and paste plain text into whatever writer you want. Maybe those web sites realized the money in it and started charging. Or like you say, maybe going to a web site is too lenghy a process, especiall if MS Word is doing it for you. (Basically I agree with you but saying yes it can be done, but there are difficulties.)
Another case in point I also agree with you. You can’t make an mp4 video from LibreOffice Impress, but MS PowerPoint will. One of my sons was the odd man out in a college cybersecurity course when it came to submitting a college project, all the other students simply submitted mp4 videos of their PowerPoints. My son who is also only on Libreoffice could not. (Untill I showed him an online service that could do it for him. But he had to give up some privacy, like giving up an email address, he used his librem.one email.)