My answer would be near identical to what @djinni_cake wrote! The cracked coat is smooth for a majority of the surface, but at very certain angles and curvatures you’ll be able to feel the texture – you can feel them on inner cups of the Gravity, and for some on the rim (just adjacent to the caps once installed); similarly, you can feel this texture on the Ari on the outermost rims and the areas near the cap seat.
For where your finger would make contact with the Ari on finger grinds, however, it’s entirely smooth, so no problems there. The inner halve of the cup is also fully smooth, so any grinds/spins that involve that area will be good to go as well.