If you work remote, you have to actually write down things, like 1. who your workers are, 2. what the teams are, 3. where they are, 4. how to contact them, 5. what they're working on, 6. who else they depend on or who depends on them, etc. There are a lot of new tools to learn, you have to learn how to ask for someones time and schedule time. That's a lot of work that managers don't want to do.
If you work from the office, you mostly have to: 1. walk around the office and ask someone. Interrupt whatever they're doing to ask anything you want anytime. Of course, there may be many offices, but then you call the other offices and ask the secretary to go around and ask people.
It's also very easy when wfh to accidentally leave a paper trail or records of conversations you'd rather stay hidden. In an office you can just talk in person with no record.
Wfh is a right that white collar workers are gonna have to fight for, the way all unions have had to fight for the rights workers deserve. Don't threaten to quit, threaten to unionize.