Personal and purely theorical thought: I don’t know if shutting down the engines and consequently losing all the reverse thrust is worth the reduced risk of post crash fire. I am not so sure that in a few seconds the temperatures of the engine core would drop below a safe level, not to mention the fact that other sources can start a fire (sparks cause by friction, severed wires, other objects hit by the plane, etc.). I’m curious to see in the report if the engines were actually shut down and how this affected the consequences of the impact.