This one anecdotally seems to have been the biggest issue for some managers. Unless they are overhearing things (literally), they don't know what is happening.
Which is silly. I have worked in infra my whole career and just one of my job duties is to know what every single team is working on and shipping to provide operations guidance/support and to anticipate and be ready for risky changes.
It's so much easier now that we're remote-first. I'm in all their Slack channels, I can see and search every conversation the team has and I can teleport into all their stand-ups and read the transcript after if I miss it.
Most of the RTO conversation is happening outside of tech. While some is (e.g. Amazon, Zoom), we all started off in IRC or email in college or before. This isn't true for all areas of the business.
This one anecdotally seems to have been the biggest issue for some managers. Unless they are overhearing things (literally), they don't know what is happening.