I prefer the FRN and FRCP lightweights. I must, I have a bunch of them. I think they are strong and have less things to rust. However, I do like to have a few knives that are 'purdy' and so have steel liners to put nice scales on. I also like linerless G10 as it is bear strong.
Sometimes a steel liner is also needed to make the scales stiffer or to reinforce a pivot or attachment point, but not always. I like Spyderco unlinered FRN and FRCP knives and they do not need anything, but when comparing to another company's Bugout knives that flex and bend, or an old unlinered Voyager that also flexes and bends, both needing liners, Spyderco is so far above these it is out of sight.
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