Some people like messing with cars. They take the time to understand what's happening and learn the process and pitfalls. Hobbyists wiil never be as good as trained professionally but we can still get the job done. I went through the trouble to diagnose and replace a bad alternator on my civic after the battery started dying too fast. I did it cause it was fun.
The other reason i did it is because the dealership and other shops quoted me over 10 times the cost of parts, and I literally did not have the money to take them up should i have wanted to. Car maintenance is expensive, _especially_ at the dealership.
Some how, we've changed the direction of the conversation to something you lost vs a software update to the brains of the car. I'm guessing just to make the obvious point the dealership is not the cheapest place for repair.??? This isn't change the tire or get an oil change. This is something a consumer has deliberately done to prevent the manufacture from making an OTA software update. These are the kinds of changes that I want someone available right then and there to be responsible if the update borked the car.