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For the same reason that, unless you drive a Beetle, 2CV or pre-996 Porsche, your car (if you have one) probably uses water as a coolant and has a water to air heat exchanger or radiator. Fluids are far more efficient at absorbing and dumping heat than air. Same reason the radiators in your house are full of water, not air. Hopefully.
I don't really understand these water cooling setups. Surely the whole point of having a circulation system is to allow you to move the radiators away from the sources of heat, i.e. outside the case. In a building, you have the AC system outside, on the roof. Including the pumps and fans, which also produce heat.
But in watercooled PCs, all this seems to be inside the case, which seems stupid.