I’m with you, I’ve had a range of professional jobs, but rarely much meaningful correspondence via email. There are definitely emails that might announce some deadline or deliverable, but the “email” part of the work might be adding a calendar reminder or something, not responding to it. If feels like (I’m sure people will disagree) email would be more of a time sink for people who have a secretarial or personal assistant role, where they are being asked to do lots of little things (get me time with your boss this week type stuff). For a developer, whether IC or manager, most coordination would take place through other channels, and not be a material part of the work.