I understand how the US and EU have different electrical outlets, voltages and frequencies. The systems developed independently, standardized on compatible versions locally, and standardizing globally would be very expensive and almost impossible to do safely.

I don't understand how North America and Europe settled on different EV charging plugs.

Three-phase power is ubiquitous in Europe, my oven and stove are connected to it yet this is a small apartment. The slightly larger plug (to fit the extra pins) and extra cables are worthwhile for the higher power and balanced consumption.

CCS1/2 (DC Fast charging) and J1772 (AC "Slow" charging) share a port on most cars. That is, the CCS plug uses the entire plug and the J1772 part uses just the upper portion of the plug.

The AC "slow" charging in the US only needs to support two-phase power (residential power is two phase) and the EU (and others?) generally need to support three-phase power.

NACS is just better in North America (versus CCS1) because it's smaller and much easier to physically handle, but the AC "slow" charging pinning only supports two phase power.

I don't know how it is in the US but there is no one standard charging port here in Europe.