and 30 pounds of muscle would make them look FOOLISH in any event that required upper-body strength and precision.
They're simply not required to do ANYTHING fine-motor skill with the appendages that were designed to perform fine-motor skill, except for the keepers, and the extent of their use of them is to get them in the way of something, and SOMETIMES hold on.
I respect the heck out of the shape that pro soccer players keep themselves in. The constraints of what the rules of their sport require of them simply eliminates them from serious competition if there is any precision upper-body component involved.