Informal "meetings" became impossible and got replaced by formalized meetings. What could be resolved with a quick look over the table to the two other devs I need to talk with, and everyone else on the team was nearby and could hear or join the discussion, now must be a formal calendar invite because otherwise we built an information silo.

I had an example of that just this Friday (but really every day). A peer review got so complex that chat wasn't nearly enough, the PR comments were getting repetitive, and it resulted into 3 full draining hours of calls full of misunderstanding, stuck shared screens, "please can you zoom your editor I have a much smaller screen than you", etc. We used to solve issues like that with a quick look on the display next to us, maybe 20 minutes of on and off discussion while doing other things, few more quick looks and it was done. Same team, same people, less senior than now (before covid).

I love the flexibility but hate everything else about remote work.