Styles are very important. To set right styles for paragraphs, character, cells and objects is something I pay attention. It saves you a lot of time once you start moving object and edit the text. To prevent spending time on moving photos and balancing columns and making sure that titles stay with text after edits, it is better to set it the way the portraits and titles are moved with text and columns are auto balanced.
And yes, it is only one root object on this page.