When scales fall off, raise, or become loose, what is the failure mode? The adhesive bond and seal fails. This is pretty much the result of a poor bond caused by any number of mistakes. If the bond fails it won't matter if you've used 10 corby bolts or hidden pins or no pins. The scales are trash. If moisture can get under the scales, it will and the knife must be repaired.
I don't say this to discredit any of the ideas here but just to submit that the epoxy bond is the most important thing for a durable handle. Agree?