I took me awhile to figure what it is that you donīt make sense but now I understand. Itīs the part about turning off Master (if time permits) and by that loosing various warnings.
I would speculate that itīs the lawyers that added this one. If you **** up the landing and turn into a fireball there is a bit fewer hot wires that can ignite a spark with all the avgas leaking out.
They say master should be off, if itīs not then itīs not RHC fault it caught fire. Usually "Fire in flight" is mostly smoke or it will go out if the engine quits.