Note that the poaching email does not have any other contact details other than the leaver's - this is to try and funnel all enquiries to the leaver as part of the poaching plan! More tips here.
No one thinks much about cybersecurity while traveling. However, email security company Tessian warns the out of office message actually plays right into the hands of threat actors and cybercriminals. It’s a social engineering attack vector that no one thinks about. The out of office message is ubiquitous and handy. But if it includes any personal information at all — such as attending a funeral or going out of the country — attackers have all the information they need to impersonate the person who is out of the office, without the attacker having to do any real work.

Think about a soon-to-be-ex-colleague that really could do with some extra enquiries forwarded their way (call it 'paying it forward').
By completing these items, you alleviate any concerns that may arise during your closure. This also ensures your business continues providing transparency to your customers. No misunderstandings.