Sorry, I think you lost me. You decreased 'appearance', to raise your 'aim', which appeared to be successful. But how does that demonstrate the importance of 'appearance'. I would think it demonstrates the importance of 'aim' more so.Then I moved 4 points from appearance (my only "spares") to aim. In the second duel, I got 2 hits versus 5.
Can we say that means very much? Not really, because it is so small an example. But I wouldn't underestimate the value of having a strong appearance to complement your aim.
In any case, I think you're right that you need some of both. If for no other reason than to protect your own attack value. Of course, with no 'aim', you have no attack value to begin with.