Everyone sits different and will need to adjust the chair for an ergonomic seating position. Beside that, everyone has to pack their environment into a bag everyday? So no office decorations, physical calendar or sticky notes and whatever else people bring and can normally leave in their office space to make it a “home base” for their work.

If people are logging in to pick an assigned seat (which should be considered part of the work day), instead of actual work, that’s a waste of everyone’s time.