I'm not privy to CCS design process, however several possibilities spring to mind: - Backward compatibility: CCS is backward-compatible extension of J plug, an

I'm not privy to CCS design process, however several possibilities spring to mind: - Backward compatibility: CCS is backward-compatible extension of J plug, and can't share AC and DC lines due to that. - Higher safety margins in CCS - CCS design by committee - Better engineers at Tesla