If the app is in focus and you click on it on the dock, it minimizes itself. You can also do Super+H.

Personally I put it back to "Windows" layout (min/max/close on the right), even though I mostly use Super+H.

Ah, okay. Thanks. That's not as bad as I thought, using the click on the dock (that would otherwise do nothing) is clever. Thinking about it, my dock does this as well :)