Generally nobody should exchange Office docs anyway, I find it much more professional to exchange PDFs. I use MS arial so my PDFs made with LibreOffice look immaculate on any device. I think people are really shit for being so attached to their stupid office. I could not sell my dad on LibreOffice though. He'd rather pay 100 EUR/yr than learn to use new software.
By default an Arial clone is present, ideally Arial is specified as a valid replacement font in the PDF if the user does not have the Arial clone present (Arial itself is a clone, but that is another story).
It would require deeper investigation to see if this is actually the case. I've always wondered about this.
PDF/A has given me all kinds of issues (windows users get incorrect glyp placement with very bad results). Regular PDF has worked fine for me.