'ideal' FET has zero gate capacitance, despite that being the way they work. I don't understand this statement. What do you mean? A FET is a capacitor (gate to

'ideal' FET has zero gate capacitance, despite that being the way they work. I don't understand this statement. What do you mean? A FET is a capacitor (gate to channel). If a gate has no capacitance, you have no transistor. Interconnect means wire. This has nothing to do with von Neumann architecture. If you have wires in your circuit, then you have wire capacitance. As transistors get smaller, that capacitance starts to dominate internal transistor capacitances.