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Barber hones tend to be quite hard and so don't require lapping. They work fine for the eternal maintenance of a shave ready razor.

If you check with the company, they will tell you that the two plates are made with the same alumina particles and the same ceramic, and that the only difference between the two plates is in the...

Agreed. Plus, if there is a "major unevenness" in a Spyderco it can be replaced for free since they are guaranteed to be flat within their defined tolerances.

If you lap the Spydercos you alter their apparent "grit" size. The only difference between the F and UF hones is the surface finish, which is altered by the lapping.