what do you want for "discoverability"? some random popup when taking a screen shot is the furthest thing from your mind? things like this are simple to find. just open the list of keyboard shortcuts or search in help for what you want to do. i like these simple features because the functionality is there when i need it, it isn't thrown in my face when i dont, it has enough configurability to make it fit my workflow, and i dont need to install additional software to do what i want.