Low power consumption, good if you are using batteries, not really relevant for model railways with mostly powered by mains transformers.
Low inertial, great for drones etc where you want quick response from the motor. Locomotives need the opposite high inertia to stop jerking, why flywheels are fitted to increase inertia.
Small size might handy for N gauge. But Hornby have produced some excellent running dimunitive Locomotives Peckett, Rushton, Sentinal, Rocket with conventional motors.
So for model locomotives not really any benefit.