Yes, you're correct. I inquired at Les Schwab about getting them siped and they advised against it once they heard where I took my truck. They said sand and small particles from gravel would fill in the tiny sipes and render them useless. The tires are awesome on snow (the narrow profile helps), but on black ice they're sketchy as almost any tire is that's not siped. They are somewhat noisy on the highway, but not too bad.
I have a pair of studded snow tires I put in at the first snow. Then I take them off in late March. They last quite a while in that scenario. If you run them on dry pavement they certainly will wear out fast.
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