Some "plastics" (a whole mix of nylons, vinyls, or other compounds we call plastics) are more durable than metals. As a metallurgist once told me, steel is more "plastic" than aluminum - it can be bent and rebent easier without crimping. Where a metal shell might tend to bend or dent, the plastic might be more resilient and bounce back. But buttons and keyboards can get jammed with grit or allow moisture to enter more than a simpler case design (touchscreen).
I'm not so sure my k3 feels cheap as it feels so incredibly lightweight that it can be offputting. But I also don't want to test its mettle (metal).
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