Chrome exists in a weird place between a desktop app and an operating system. While the Chrome app launcher makes sense on a Chromebook, it's weird on other desktops. So Google's removing it. Google announced the change on its Chromium blog. Over the next few months, Google will start to phase out the app launcher. While it will still be included for a while, Chrome will no longer prompt new users to try it out. Eventually, it will be removed entirely.
Retiring the Chrome app launcher [Chromium Blog]