Because it's far more comfortable (and arguably ergonomic) to not have to move your hands 6 miles to reach the F-keys or numpad? Or to have your mouse so far away from your home position in the alphas because of the numpad and nav cluster? It's also very easy to have small keyboards that still retain arrows if you can't cross that bridge, even with 40%'s. And with a little bit of effort to customize your layers you could easily reach a numpad and all your function keys by barely needing to move your hands.
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