Why wouldn't they be on the same circuit? The monitor and computer are in the same room and would generally be plugged into the same outlet. I think this would be the rule rather than the exception.

That’s absurd. Most people will not only plug them on the same circuit, they’ll plug everything into a single multi plug feeding from a single wall socket.

I’ve never seen anyone, in corporate and home environments , split their circuit use like you describe.

I would argue most people wouldn't even understand concepts like a circuit.

All they would see is an electrical cable and plug in hand, and an electrical outlet on the wall. Put two and two together, computer turns on. Circuits? Watts? Load? Might as well be pig latin.