That would annoy me too but I would say a "mirror" finish doesn't necessarily mean the surface in question has low stiction or is especially uniform and can in actuality increases friction as the surface is not ideal for the retention of lubrication. If minimal friction is the required trait then there are pretty much two processes to achieve that and polishing is not one of them. They are, Isotropic Superfinishing (also known as the “REM process”) which is a chemically accelerated surface finishing and WPC Treatment (Wonder Process Craft) which is a Fine Particle Peening and improves slide-ability and fatigue strength. These two have a very different visual surface finishes but both lead to greatly reduced friction.
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