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Expediency. Same reason our games don't put a weight limit on how much players can carry in their inventory and the same reason players eat but never have to pass bodily waste.
Why?
More detail and more realism is sometimes better and sometimes worse, and it depends on what crowd you're targetting. Blanket statements involving "should" and design miss out on the vast potential that exists as a result of wildly different preferences among players.
--matt
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