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1) the factory nitrate is only about .010 deep into the sideplate surface so when you resurface a badly worn plate you cut through the original harding which leaves soft cast iron for the side seals and corner buttons to ride against.
2) the rotor does not ride against the side plate so it does not need hardening. Ceramic coating is a better choice to help keep the excessive heat on the rotor face and to help control oil temps.
3) I have been involved with cryoed brake rotors on all out race cars and for some reason they last longer than ones not cryoed so it does something good to the metal.
4) shot peening uses small steel shot like steel bbs to beat the metal surface to remove internal stresses.
5) as in any engine rebuild you have to be mindful of the clearances on all the internal parts going into the build.
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