Did you want to light the LED and you got turned down on the fly? libgpiod!
Make GPIO easy and easier but do not try to make it a given...
Did you ever want to use another radio band to control your LED from a distance w/ an Xbee by way of push button?
Did you ever want to use a FET for switching your LED on and off?
Did you ever want to know if you were moving while you slept?
Did you want to change from ARM to RISC-V Processing and did not know how to make the jump? BeagleV!
Did you ever want to have a nice LED blink off and on while OpenCV recorded video from your WebCam?