The only thing I hated worse than going into the office was our remote employees, who never seemed to be available when you needed them, had their status set to Away (or wouldn't respond for hours if they were green). It was a privilege, people abused it, and now it's over. And managers were the worst offenders.
IME, managers do this in the office just as much as remote.
Look at the typical manager's schedule. It's completely full of meetings - most of which are bullshit "busy" meetings, and they never respond to anything timely.