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As if there are "studies" backing the claim that arrow keys are easier to use for navigation than the home row keys... Personally I don't want to move my hands from where I'm writing to the other side of they keyboard just to move the cursor.
They could have laid out the arrow keys WASD style. One up, one mid-down, two to the sides.
Nobody said they had to use dedicated arrow keys. Just lay them out like a normal human being. Whatever key for up should be up, whatever key for down should be down, whatever key for left should be to the left, whatever key for right should be to the right.
HUJK, for example. WASD is the standard example.