Not everyone needs a razor edge and I imagine the pocket sharpener can put on an edge that'll cut through a piece of rope or such. There's nothing wrong with not choosing a razor edge especially on a knife that might only get used once or twice a day.
I use an old school steel on mine, but the other day I couldn't find my steel so I used my ceramic coffee cup. I had forgotten how well that coffee cup works, goes to show how important free handing is. Free hand sharpening is a skill that takes developing and practice which most people don't feel a need to learn, so a pull through sharpener serves their needs well.