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very uniform grits and faster cutting in the stones mean you get an even finish quickly, and the watery goop + swarf that comes off helps to cut quicker. Plus for very hard knives/tools you'd be through the wet dry paper in no time at all, especially on the higher grits. At least for waterstones this is.
I use my dad's 30yr old norton indiastone dry to do all my families' kitchenn knives and it hasn't concaved at all, but they're softer steel. I imagine wet or dry paper would work at a pinch in those cases.
jupiz-
Thank you for the reply, think that the bit I don't get is the stones going concave as I thought that the stone is the hard bit and that the water or oil is to clean the surface if the stone of the detritus generated. Then using the whole length of the stone with the same pressure to keep wear even.
lynx
So why not just use wet or dry on a piece of modern glass or mirror, have used this technique to make well worn knives sharp again as I didn't have a stone available. So would it make an easier sharpening with out worrying about stones going concave. Or am I missing something?