Although the act of writing is an intimate affair, where even a 13″ laptop screen can be ideal, allowing the author to focus, the act of editing and constructing a large document and thinking about connections can benefit from a larger display.
The 27″ Apple Studio Display really does provide some more space to see and to think.
Almost like XR in scale, though of course there is no third dimension. It was the act of working in VR which really showed me how more space helps however. If the current headsets were less likely to loose connection to my Macbook and had less screen door effect, I might not have needed to purchase this screen and I would have had the benefit of an even more flexible, and portable workspace.
I went from this when working in the Map view in Author:
to this on the Studio Display: