The issue is using both ADEXP and ICAO4444 waypoints, and doing so in a sloppy way. For the waypoint lists, there is no issue with structurelessness -- the fact that they're lists is pretty obvious, even in the existing formats. Adding some ["",] would not have helped the specific problem, as the relevant structure was already perfectly clear to the implementers. I am not lying when I say the bug would have been equally likely in a JSON format in this specific case.
Now I'm wigging out to the idea of how the act of overcoming the inertia of the existing system just to migrate to JSON would spawn thousands of bugs on its own — many life-threatening, surely.
