Dale,are you referring to the very first pot that Boon showed in this thread? Personally, I like the effect a lot. It isn't just sanded to smooth it out, it really has some intriguing texture. The grog wasn't just dragged across the surface, at least it doesn't look like that. The surface texture gives it a very sculptural look. I often buy pots on the basis of their tactile appeal.
I'm not saying that sanding is a good idea, but then again there are many methods of doing ceramics, just as there are many methods of doing bonsai.
I've seen really excellent sculptors use methods that they wouldn't necessarily teach or recommend, because it gives the effect that they want. Sometimes they keep it a secret! "Do as I say, not as I do." Old potters have shortcuts, and although they value ability, they usually aren't above a few side tricks.
I remember going to some greenware classes at a local pottery, and the lady said " We NEVER use water on our greenware!" Well, maybe she didn't, but plenty of other people do, and if it's part of the way they work, there's no harm. A little water to smooth the surface and lay down the grain isn't a bad thing, it's only bad if it's overdone.
Just my two cents worth.
Joanie