Counter point: I've written and consumed user manuals both in my private and professional life, and they're really very useful.

- It's a great ice breaker into the things they're actually interested in.

- Some people have a particular way they want to be addressed. Pamela, never Pam. Put it in one place and you're golden. (Ideally, someone would be able to put it as their Slack or Email handle and also be golden, but those are not always in the user's control at a company)

- How's the best way to get your attention if it's urgent? If it's not urgent but still time sensitive? If I want to make sure not to disturb you?

- What's your biggest office pet peeve (it's chewing ice for me; some people never realize that it could bug someone else)

- It's an easy and intentional way to disseminate your work history to your colleagues, who most likely won't have way to view it otherwise. (For example, knowing someone was a DBA gives you a potential point of contact for related questions)