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The theory is that it makes the blade tougher, more shock resistant, and more stain resistant. Can't comment on the first two, except to say I think most actions that would test those theories are outside what I'd consider reasonable use for a folder. As for staining, I use my Stretch a lot for food prep, often rinse it off, shake it dry, and return it to my pocket. Never seen any sign of rust. Have managed to cause a blue/grey patina type stain using it to spread mustard, but have done the same with a couple VG-10 blades as well.What's the advantage of a laminated 420J2/ZDP-189 blade?
In addition, laminated ZDP may not require quite as sophisticated equipment to work with, so more of the small makers Spyderco uses in Japan may be able to build knives with it.