Had the recent pleasure to hone & shavetest one of these for a customer...
I wanted to keep it :D
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Joed has the best explanation I can see here and he is exactly right. However, when you et into the W&B 8/8 you better be pretty steady and light touched, because they give great shaves but are much different in how they work.
Good Luck!
+1 to both of these! Livi does full hollows, but there are not many others who do them often. Maybe it is a choice on the side of the customer, (I think that mass=value is an important point), but it could be that heavier grinds are simpler do to.