Even if you don't understand it, if you stick to a reasonably low words per minute, you can write down dots and dashes and simply look them up in a table. Unless you're pretty dense you only have to look up the two letters "dash dot dash dot (pause) dash dash dot dash" about 20 times before you memorize it for life. I did something like this with some Russian ham radio satellites, um, quite a long time ago. It turns out their telemetry stream didn't use the entire morse alphabet which caused me some trouble later on LOL.

Back in the "old days" PCs that failed their BIOS boot had a whole symphony of weird beeps to indicate which failure mode applies. So two short low pitched beeps and one long high pitched beep meant "video bios missing" or something (specific example made up, general idea does apply). I always thought morse code would be an infinitely better user interface. Although I had internet access, this was before widespread adoption of it and well before the invention of the www so you can imagine how much more useful plain english morse code would be for error codes vs seemingly random beep patterns.

I also used to own a pre-ODB2 car which output its "code failures" by a light flashing method very much like the article describes. Three flashes short pause 4 flashes long pause meant engine computer undervolt failure aka its time to replace the five year old battery, or at least it was something very similar.