And a Touchpad, even fewer games use that! The rectangle in the middles primary use is a touchpad, but almost all games that use it use it's secondary function as a button.
It's good for writing messages with the cursor hovering over the letters, it's used in TLOU Remastered and Gran Turismo Sport as well. (Only two games I own so far)
Plus if you use it on a PC you can control your mouse with it and right/left click etc.
Great controller.