Surprisingly no mention of the Z80 "trap gates" in that section, as it's extremely relevant: https://retrocomputing.stackexchange.com/questions/11143/in-...

Huh... I'm no EE, but measuring the complexity of an analog circuit in gates seems odd to me. For starters, the added circuitry isn't just one gate. There's a few capacitors added as well. And something tells me if someone were to add a parasitic circuit like that, it'd have to link up all over the parent circuit to probe voltages. Obviously it wouldn't be noticeable in a finished product (much less in an IC), but I wonder how noticeable it would be at the design stage by other humans.