Draft/normal was the default in Word 2003. Most people have used it.
The problem with page layout mode is that any non-trivial format change, insertion, or deletion requires repagination and the UI freezes until that is completed. Draft mode repaginates asynchronously so that it remains responsive. Comparing a WYSIWYG editor to a plain text editor is no contest as the former performs much more work to layout the text.
The problem with page layout mode is that any non-trivial format change, insertion, or deletion requires repagination and the UI freezes until that is completed. Draft mode repaginates asynchronously so that it remains responsive. Comparing a WYSIWYG editor to a plain text editor is no contest as the former performs much more work to layout the text.