Close enough for two cigars
First, the name is Rich, not Ralph.
Second, when I got my Epicurean with all metal gears, I got two. I tested both and selected the quieter of the two, and returned the other (Costco is good that way).
Third, it is NOT a gravel grinder. It is quiet and efficient. Way more than I need, by the way.
Fourth, planetary gearsets are inherently very strong. That's because the ring gear contains the loads on the sun and planet gears, sparing the bearings or bushings. There's a good reason why these gearsets are the heart of most automatic transmissions. The gear case does not carry the bulk of the burden of the load.
Fifth, if the reset switch pops, it has thereby protected the gearing, metal or otherwise. But it's been my observation that of modern machines, there is generally no reset switch on plastic geared KA mixers. The plastic gears act as sacrificial components to protect the motor. Unfortunate for the owner because replacing those gears is a costly and potentially time consuming repair. Versus a simple reset of the circuit breaker.