Pretty much nothing was missing from the J1772 protocol, that's why NACS by and large speaks it and CCS1/2. That's pretty much the answer to all your questions

Pretty much nothing was missing from the J1772 protocol, that's why NACS by and large speaks it and CCS1/2. That's pretty much the answer to all your questions, it's a different plug standard using other SAE standards for communication. As to why it won out in the US, pretty much solely due to the fact that Tesla is basically the only national charge network that gives a damn about their charge network. It's a crap shoot for basically every other charge location and the actual coverage is pitiful compared to the Tesla network.