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I write code for embedded systems that have hard real-time deadlines. Flashing an LED is an inexpensive number of operations compared to most other diagnostic techniques. I can connect an oscilloscope to them to get meaningful accurate time measurements. I am not blinking out Morse code status messages (although I have considered it for some particularly squirrelly problems).
Saving them for my retirement. (I will probably only retire when my health is so poor that it is clear that I won’t outlive my retirement resources.)