I'm sure they knew what they were doing when they designed them.
They mustn't need them.
Designed? They copy the backplate from the OEM and stick some new compound to it. All credit on the R&D on the compound, but skipping the springs is just lazy. No, they dont 'need' them, because racecar, however they would be infinitely better for having them, reducing the knocking and squealing which are the biggest complaints about them.
Brake pads are a proper PITA, as the new legislation means that anything uprated is effectively not acceptable for road use, and less focus is given to making them civil to live with. IMHO RC5s work fantastically on the road, even from cold, but I couldnt live with the squealing in the end