Ceramic blades on cutters that are supposed to save your life sound like a really bad idea. So easy to chip them on debris stuck in the line or nets, and then good luck cutting trough anything.
Rusty metal blades on a trilobite will still slice trough anything.
Do you specifically have an experience you were directly involved in where you managed to fail (both sides) of the blade? Or, another internet urban legend? I'm truly curious.