USB 3 is significantly more complicated to implement, and the hub chips are quite a bit more expensive. Hardware-wise it would've become by far the hardest part of this board.
USB 2, on the other hand, is fairly trivial. You almost have to try to get it wrong - especially when you are not concerned about certification.
USB 2, on the other hand, is fairly trivial. You almost have to try to get it wrong - especially when you are not concerned about certification.