When Sharkskin was released there were consumer concerns about guide wear. SA set up an illustrative experiment that they brought to all the Shows which cycled Sharkskin under load through arched guides in a continuous loop. Their point was that relatively soft vinyl, regardless of surface texture, was not going to impact chromed stainless steel. Not all guides are made of the same quality material and the increased surface area of textured line may perhaps hold more abrasive bits of grime which could enhance its cutting properties. Texturing fly line's surface has proven to enhance shooting and line pick-up off the water's surface. Sharkskin may have been too aggressively textured to fish well and the newer surface treatments of lines are quickly surpassing the first modern textured lines.
I say modern because in the 1970's an English company named Masterline made very high quality textured surface lines that were briefly popular on these shores. I still have one mounted on an old LRH for use on a 7 1/2' cane rod and it is a lovely pale olive color. Haven't cast it in decades though.