That it is!

AFAIK all Kyoto (finishing) hones have friable grit particles that break down in thickness rather than size (Max, Alx & So say they do & I believe them), but the question I think is how much & how quickly it breaks down.

Let's say you have a hone that takes longer to do this & you make a lot of slurry. You could dull or eat the edge before it has a chance to do its thing. Then, the cutting power could be slowed to the point where you can't recapture the sharpness you lost early on & you could think your stone is no good when it's fine & you just made too much slurry. Especially w/ what Glen said about the pressure & sharpening area of western razors.