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That would slow the destruction, but you're still using the expensive and hard to replace hub shell as the sacrificial element. Aluminium free hub rotors are cheap, easy to replace, alternate loading over the full width and don't experience load reversal, but manufacturers still consider it a benefit to add steel inserts to slow the inevitable destruction.
gbj_tester
What about a wide foot sprocket? Should in theory prevent the sprocket from digging into the softer spline...