To note, the J1772 connector (the mainstream AC charging port in most cars in the US) also does not have 3 phase support. For commercial charging, the typical approach is to just use 2 phases of a 3 phase commercial supply for AC charging. This basically means commercial charging is limited to 208V (2 phases of 120V that are 120 deg out of phase).

So, there's no loss of function going from CCS in the US to NACS.