Re: not sure about the clutch
the clutch on your car has a relatively massive surface area, thick layer of friction material, and weighs a number of kilos. Its life is based on the amount of material it can lose before no longer providing enough friction to turn the driveshaft/diff/axles/wheels. It doesn't need to exist in the vicinity of sensitive electronics (in fact it exists in a bellhousing isolated from both the gearbox and the engine, partly so that clutch material doesn't contaminate the oil and partly so that oil doesn't contaminate the clutch plate, which will cause clutch shudder).
*carrying* energy isn't the issue - the strength of the diaphragm pushing the plate against the flywheel determines how much power it can effectively carry (as well as the formula of the friction material, but clutch plate pressure is the most common/cheapest way to give a "stronger" clutch).
Dissipating heat IS an issue. Car clutches are actually pretty bad at dissipating heat (sit in traffic for hours on a hot day slipping the clutch and the pedal will get spongy, and there are plenty of vids on youtube of people thinking they're spinning their wheels when they're actually frying their clutch - usually because they allowed a tiny bit of slip, which heated the clutch, which reduced it's friction coefficient, which very quickly resulted in the clutch getting fried). Sitting in a confined bellhousing with no ventilation is part of the reason clutches "come back" very slowly once overheated, a fact seen quite a lot at the beginning of endurance races where a car has to get off the line with a full tank of fuel as quickly as possible - usually by slipping the clutch a bit.
The clutch on your car is also not a centrifugal clutch - a centrifugal clutch will slip and engage as soon as the rpm of the shaft on which the shoes are attached to exceeds the point at which the centrifugal force acting on the clutch shoes is greater than the springs holding them in. A bit like those old "flying saucer" carnival rides where you get pushed out against the walls, but instead of the walls being attached to the bit spinning, friction between you and the walls is required to make them spin. Every time the motor spins up enough for the fan to engage, there will be some slippage, and to use the clutch to run the fan at a lower speed will require constant slip (according to the design referenced in the article).
Put your car in gear, handbrake on, and constantly slip the clutch (give it about half throttle, and let the clutch out until rpm sits around idle). Then see how long your clutch lasts. (and how hot it gets - I'm guessing it won't be too long before it starts smoking).