I agree with your assessment of the current LCC specs. My layout has a DCC power bus, and a 5 volt power buss for led's, ESP32's, and servo motors. MQTT is seeing use in the auto industry, where the CANBUS has been employed. I think that covers concern about noise and interference.
The great thing about the ESP32 is the low cost. Most CAN hats for the ESP32 cost as much as the basic unit.