> Managers will have to let go of the desire to see that everyone is in their seat.

Was it front-line managers who thought this or directors and VPs? Front-line managers have a better pulse on what their team(s) are doing by keeping an eye on Github/GitLab/VSTS checkins, PRs, and kanban boards than by seeing who has a butt in a seat. It's usually the more senior (and disconnected) managers who get nervous when they don't see their domain fully staffed between 9am and 3pm.