Well, I'm not going to argue with an expert.
I'm just going by the reports I've read. I've had one UBEC die (not yours) and it just stopped working by outputting 0v (actually, closer to 0.5v). I just figured a switcher "IC" had various disaster compensation built-in (overload, thermal, etc) compared to a discrete design like the one in the CC BEC. At any rate, this mod was to prevent the MMM BEC from powering any external load to [hopefully] prevent it from dying.