> On Chromebooks, Chrome's fantastic profile system is deliberately conflated with Chrome OS login sessions, which makes it harder for one user to maintain multiple independent browsing contexts than when using Chrome on other platforms. Power users on Windows can run multiple browsers, or use profile systems in browsers to keep separation, but on Chrome OS, you only get two de facto contexts (the white one and the black one with the cool spy icon), you blast the same cookies everywhere, and half your builtin applications are just hyperlinks to auto-log you into the corresponding Google product in your global white context. Applications like Hangouts (the app, not the extension) are rare, where the entire window inherits your OS login, but keeps your context entirely separate from what you're doing in the browser.

ChromeOS actually has the ability to sign into multiple accounts at the same time and fast switch between them. It's not obvious in the UI though, so many don't know about it. https://support.google.com/chromebook/answer/6088201?hl=en