I will always assume it is an inability to interact in an adult fashion with the world of technology. There is no good reason to avoid voicemails so aggressively – those that are doing so should probably be seeking therapy to overcome their issues with technology and/or the human voice. A lot of us process text faster and more accurately than speech, especially poor-audio-quality speech recorded by someone who didn’t bother to leave all the relevant information. Most voice mails are bad.
To remind us – as if we needed reminding, as we vainly strive for ‘inbox zero’ – of just what a time drain email has become, Kay Woodward, UK-based author of What Would She Do?, has wryly channelled one of her book’s real-life heroines, Emmeline Pankhurst (and Pankhurst’s movement’s motto) in her OOO. “Deeds, not emails. That’s what the Suffragettes need. And let’s face it, I’m probably in prison anyway, so couldn’t reply even if I wanted to.”

I am on leave and will be back on X date and answer your query shortly after that point. If it is more urgent please contact Wakeen at [email protected] for issues related to llama and Lucinda at [email protected] for issues related to teapots.
I give my folks scripts because, otherwise, I end up with long winding OOOs that talk about why they’re out but not what the writer/caller should do to get help (staff is 1/3 entry-level with varying degrees of professional office familiarity). I do not have the time to micromanage to this level, though – if I see an off-spec OOO, I send the how-to guide and remind them that they need to tell people who to call while they’re out or to mention the specific dates, but most of them have good judgment enough not to be totally inappropriate to the point I need IT to intervene.