But a resistor or doide only have two connectors. How could one possibly hide a tiny CPU or RFID chip inside with only those connectors? Two connectors would be the minimum to just power the chip up.
"One distinctive feature of the bus is the possibility of using only two wires: data and ground. To accomplish this, 1-Wire devices include an 800 pF capacitor to store charge and power the device during periods when the data line is active."
You can buy devices that put an entire JVM inside a two-terminal component, of similar physical size.