The out-of-box page structure in AEM is broken and do not conform to HTML5 Standards making it very difficult to implement any decent accessible page structures, it's a `<div>` nightmare :), I'm wondering how you guys deal with this.
The new semantic elements introduced in HTML5 bring the ability to describe the structure of a web document in a standard way. They bring a big advantage for people having HTML5 browsers and needing the structure to help them understand the page, for instance people needing the help of some assistive technology. These new semantic elements are simple to use and, with very few burdens, can be made to work also in non-HTML5 browsers. Therefore they should be used without restrictions.