An example of doing the same thing, the Right Way, would be Quicksilver or Spotlight on MacOS.
What's the use case for the launcher (activities menu) on G3? If you've invoked it, either by throwing your mouse to the corner or by hitting the super key, you either want to:
1. Start something
2. Close something
3. Switch to something (that being an open app or a virtual desktop).
Zero of these cases require, or even benefit from backgrounding all open windows. Compare and contrast with the Win7-Era start menu and taskbar, or Ubuntu Unity's sidebar, or MacOS's Dock.