An out of office message is simply an automatic response to all incoming emails. You can set it up prior to leaving on vacation or taking a sick leave.
But for employees at Daimler things are a little different. Email these people while they are on holiday and you will get a message like this:

I agree that the reasons are not relevant. But at my last company, a coworker had overly short out of office messages. Examples: “out of office today.” Or “out of office until Monday.” With no additional information about coverage, etc. Those always felt overly curt to me and made me wonder, is this person okay? Was this OOO planned or are they on the verge of a mental breakdown? (It was a very toxic culture so this wasn’t out of the question). I would be curious to hear others perspectives on this. Is too little information just as bad?
There’s a grim, apologetic vibe to these messages — I’m sorry I’m taking time for myself but I’ll try to check in on occasion! They’re a vivid reflection of a work culture that valorizes constant productivity and the near-total overlap of work and life. But they’re also do a terrible job of what they’re intended to do, e.g., set realistic expectations for both sender and recipient. A vague OOO message traps both parties in an uncomfortable liminal space where both productivity and rest go to die. The original sender is left unsure if they’ll be getting a timely response or a whether the email will go ignored for a time or forever. The original recipient has taken what is a rock solid excuse (time off) and cheapened it, offering a backdoor for email guilt to creep in.