when programming for a site nowadays, with over a billion sites online, you need to sure that your site becomes visible among many. You only can reach that goal if you program and design a site with its respective search term implemented into your site. That being said you will understand why so many people try to make their wixi, wordpress, drupal or joomla sites SEO friendlier. That cannot be done as you cannot change folder names after the site as built. For that reason CMS is unsuited for true SEO.