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You need to consider the total weight of the piano (say 300 pounds / 135 kg for a small upright, up to 800 pounds / 350 kg for a full size grand) compared with a typical piece of wood furniture. When a piano is moved about by "non-professionals", there is the possibility that a lot of weight gets transmitted through the hinges on the lid and the fallboard ...
Piano hinges don't put much force on the individual screws and they can (depending on the build) be taken apart by pulling out the axle. The metal is pliable enough that there is nothing that would make a permanent buzz or noise or transmit a considerable amount of sound.
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