I think this is great. A little too long, but it would work well as an internal reply in a large office with the right kinda culture. I’m imagining how useful it would be in my previous office with 300+ people that always had some “fire” or another to put out. I also appreciate how it protects the sender’s time off–at no point does it say “ok, fine. contact me.”
There are a million reasons why people feel the need to sheepishly telegraph that they’ll be checking email while OOO: a toxic workplace culture; a set of bad managers who don’t model work/life balance or use manipulative tactics like saying, ‘feel free to take some time if you need it’; companies that are so focused on lean growth they don’t have anyone to pick up the slack when an employee opts to take time off. These days, merely having the confidence to step away from your job by taking the vacation time granted to you in the terms of your employment agreement is still a privilege in the American workforce.

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.
I, for one, tend to forget to set my automated out-of-office (OOO) email responder and scramble to do it before the plane takes off 🙈 It’s important to inform your customers and business associates (and remind your colleagues!) that you’re away, especially if they’re expecting a prompt response.