Well if they have short t Rex arms, they can't fight off at length to use their feet too. I am not saying feet doesnt matter, it does a lot but how much does it matter if you are being engaged at a length where feet doesn't help?
Think of range on a fighter as an example. You can dance around all you want, but once that jab keeps hitting you, it will have an effect. I want great feet, but you also want arm length to be more 34 inches or so. People can be taught better footwork, you can't teach the arm length.