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.
Alternatively, some people will check their email while on vacation. Then, the text should indicate how often people may expect their email to be seen and acted upon.

Boss would put up an OOO when attending an event off-site, but would still be answering their emails, which meant that I would get “Boss said you were the correct contact, can you help?” Inevitably, I would respond and, two hours later, Boss would too, cc-ing me on the original email in which they shared the exact same info I had earlier that day. It was MADDENING.
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