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Yeah, anything that requires a fluid drive is fairly lossy. Fluids are quick to thermal transfer, usually, and the heat energy has to come from somewhere, right?
What a clutch fan is doing is leveraging airflow against heat energy. If the air is denser than the amount of power being transferred, the fan doesn't speed up, which heats the fluid, which gets thicker, forcing the fan to turn through the air. It's a net waste of energy in any sense.
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