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Of course they can flatten, once they've been trued. And periodically checked and retrued - just like any other tool that's subject to wear. If you don't agree, then don't buy one.

Just because the product is shipped rough-cast from the factory doesn't mean there isn't a purpose for it. I never trust anything as being true until I've verified it myself, especially honing...

Thanks for all the suggestions - I have the stone sorted now. After lapping with the DMT 325, I progressed with wet or dry sandpaper up through 1500 grit, then polished the surface with the Belgian...

That's a good idea, I'll do that! Are you also in the Hampton Roads area?

I'm having a similar issue with a JNAT (Shoubudani Asagi) that I just flattened - it feels smooth, but has a matte finish versus the semi-glossy surface it started with. It's not just a cosmetic...