I think there must have been a discussion about this here in December, because when I recently came to set my OoO recently there was some previous wording along the lines of “I will be spending time with my family during the festive season and will not be checking my email until (date)”. I’m annoyed with myself for deleting it without saving it somewhere, because it was much better worded than that and I’d like to be able to use it again!
Eh, figuratively. It’s like saying I’ve gone to lunch even though I’m still right here eating at my desk–the point is that I’m unavailable to do any work.

This is what I’ve seen most often in my career. Problem is, the contact is almost always the admin. I’m the admin. Everyone’s idea of assistance is different. Often, I didn’t have the knowledge about the issue in order to be of any assistance. I wound up spending more time running around looking for answers than actually working on what was on my own plate. It’s exhausting. Otherwise known as “please don’t call us for unicorn problems when we handle llamas. Literally, we can’t do anything for unicorn problems.”
Or they work with one or more of those people that call you 5 minutes after sending an email if you don’t reply.