I thought that the first serious objection to hydraulic disc brakes from the get-go was the rotor overheating and the fluid boiling, leading to failure on long descents. People could lose one, then doing the same thing lose the other, and were cautioned to feather the brakes, and let off periodically on big hills. My impression was that those problems were mostly solved, but not completely.
So I didn't think it was new, nor unusual for both brakes to fail. Or did I imagine that history?