Hydraulic FT issues/rumors?

do roller cams work harden themselves in the lobes? Id try a roller regrind off a stock blank but I thought the lobes had to be hardened? Maybe that's a FT thing. rollers provide less friction but a proper hydrodynamic wedge provides little to no metal to metal contact in a floating bearing. Cams may be different with its pulsation type load, especially a solid.
Different (harder) material used for a roller cam IIRC