Evolution in sick plastics probably contributed to the perceived devolution of pedals.
I don't think plastics deform or anything, but the weight difference in the bodies means the initial impact could be more gentle, and the second half that comes whipping around to finish you carries less energy too.
I once dreamed of a JCPC half that was made to grind, no pins, thicker, PLEG compound or something, maybe some surface sliding contours. PLEDAL BODY or something. Ever been on the table G?