My first experience with it was I couldn't figure out how to shut down my pc (the stupid side charm bar) on Beta 1 of Windows 8.

It was last seen perhaps in the Windows 11 Beta 1 release, confined within the start menu and I think this is where it peaked. It was removed shortly after to the yuck we have now, perhaps slightly coming back in 25H2 with the New Windows 11 start menu experience app groups (I have not personally used it)