The law mandates a future revision of the norm, which is focused more on having a uniform charger for all device, like mandating at the beginning CCS2 everywhere avoided us all the NACS2CCS1 and vice versa that you ahve in the US.It's not only likely that a new future port design will be better than USB C, but also that the new port will feature better technology. This is like asking why we need a new port when we have USB A, or what is missing from a Nokia flip phone.
Also, Apple lost, IMO, any chance to complain when they moved all iPads to type C and kept all iPhones on lightning.