Google is starting from a clean sheet of paper, so they have a lot of freedom to design the OS the way they want. From a security perspective, Google has a number of options, ranging from evolutionary to radical. Google could have chosen to make an OS that looks and acts a lot like today’s operating systems, with a windowing system, local file storage, multi-threaded processes, a Web browser, and locally installed applications written in native code. At the extreme end of what Google might do is the iPhone model, circa version 1.0 of the OS, with no third-party app support.”]
Source: https://www.csoonline.com/article/2136020/securing-google-s-chrome-os.html