I dunno – I think it says more about the writer than the culture. I worked in tech where there were always a handful of people who would do stuff like this, but most people would keep it basic. I just think some people love putting funky or gimmicky twists on rote stuff.
If you don’t see the Automatic Replies button, follow the steps to use rules to send an out of office message.

Like, relax. If the dates are outdated, you can probably safely assume I’ve returned already and that I’m spending my time getting back to people instead of worrying about my very clear out-of-office message. If you’re really concerned, you can contact the backup person whose information I provided IN THE MESSAGE to confirm or just, you know, text me.
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.