Well if the Silkies were to big , thats not good, they are suppose to be bantam size in the US.
But as far as the standard breeds go, yes, it is shocking isnt it. What you are seeing is the difference between Industrial/production breed birds and birds breed to the original genetics (or intention of the person or persons who came up with the breed).*
*in the US we breed more for the cosmetics of the originally birds, size, feathering, comb etc. In some breeds this shouldn't be, some breeds were designed specifically for egg production, or egg color.