This is mostly a thought experiment, and LEDs have long been used as useful indicators in oscillator circuits, but LED noodles can be a useful tool to help "see" what's happening in a circuit.
@grajohnt there’s something intensely sci-fi about wires that blink as signals go over them.
@jon in many ways, it's more intuitive than seeing signals on an oscilloscope. Less useful, perhaps, but still a good learning tool, I think.