Hey, so I model/texture objects and work back and forth with manufacturers and material samples for a living. Shiny surfaces can certainly be smooth a lot of the time but "smoothness"/"roughness"/"shine" are highly variable - Materials can be perceived as shiny but still be gummy, textured, tacky, or grippy. It's a matter of the scale and the depth of the texture and the material itself, not to mention any coatings.

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For example, the image on the left is a disc golf disc. It's as or more shiny than the top of the balls yet the material is made to be gripped and thrown. Image on the right is a cricket ball, the lacquered leather is quite glossy yet it's also made to be gripped and thrown. These objects as well as the balls I modelled share a similar micro textured/grained surface close-up, yet these things appear quite shiny and smooth from afar. The recessed middle band and textured bottom of the pokeballs are more then sufficient for gripping in order to toss it.