I mean... you're talking about exactly the same behavior as Gnome with a dock. I have a single application icon, clicking it once brings up the last window I h

I mean... you're talking about exactly the same behavior as Gnome with a dock. I have a single application icon, clicking it once brings up the last window I had open. Clicking it twice displays a preview window for each open window, any of which I can click to fullscreen and focus. It's literally the same as the macOS dock, complete the with the dot indicator for number of open windows. Plus my upper left hotcorner displays all application windows, and I have my upper right set to display each window of the current application. They're preeeetty much identical. I'd know - I use both daily.