Mushroom powder has its uses, yes. Mainly industrial.
But for me, a huge part of the joy of mushrooms is their texture. And texture is also a key feature of Chinese cuisine.
I also think that most dried mushrooms, at least in China, aren't so dry that they would grind easily. But I've never tried.
(I'm posting this from a train somewhere in the middle of nowhere in southern China. We haven't moved for over an hour. Hope I'm not late for the promised lunch tomorrow. I think mushrooms are on the menu! Along with many other things. Sleep now. Nothing else to do.)
