What is really troubling about these types of problems is that there are more and more parts of the vehicle controlled by "Smart" systems. Most of the JK is under computer control and monitoring which means in theory that dealer mechanics should be able to collect endless amount of data for troubleshooting and rapidly identifying the source of the problem. Obviously, in practice this is not the case. Either the engineers at the factory are not providing the necessary diagnostic tools or the mechanics at the dealer are not provided adequate training.
For the most part unless they can record the data as the issue happens they won't get much info. Codes will include freeze frame data but for me it was being able to see the before/during/after that helped most and that required me to be able to duplicate it.