It's crazy how bad most onboarding docs are for corporate teams. I think it's a great first look the culture and how much of a hassle the role will be.
The last three teams I've joined have been brutal with how little was documented or how out of date the docs that did exist are. I've had to spend up to two weeks tracking people down to find out what access group I need for our logs, deploy pipeline, etc. and I end up writing up a new doc that's good for its point in time, immediately becomes out of date when someone adds a new system or access group but doesn't document it anywhere.
The one team I was on previously that got me everything I needed in about two days was great, but it's sad that this isn't the norm. Everywhere else has been pretty hostile to getting set up, and the poor onboarding experience has been a preview of the developer experience. My current role is standing up a new devex team which I'm hoping turns the tide here.