I see where your coming from Metal, but being short has it's advantages on certain exercises and being tall has it's advantages on others. For example, on bench, if you take 2 guys that are the same weight and benching the same weight, but there's over 6" difference in their arm length, there's an obiovious difference that the person with longer arms has a longer way to push the weight. So I think having short arms benefits on bench, and it's the total opposite on deads. If you have longer arms, you don't have to lift the weight as high because yours arms are closer to the start position at the end. I mean ROM obviously is going to be relative to the length of the movement and extremities are going to play a role in that, there's no way around that