Mobile site (if it exists at all) is separate in terms of content management flow and URL structure, creating SEO challenges. Unless a site has a dedicated tech team or is using a framework with decent mobile functionality (aside from WordPress, there isn’t many), this is difficult. Developing a mobile presence is a lot of work. Device detection, image resizing, content syncing… Mobile used to be difficult. Mobifying a complete site takes from 5 minutes (a blog) to several hours (a complex Portal like TechVibes).