You can take ANY breed and look at certain attributes that you like or dislike and breed them in or breed them out.
I believe that a breeder needs to stick with certain attributes like eye color, skin color, feather color, comb type, etc. However, the SOP contains many descriptive words that are subjective.
Things like "medium", "tall", "broad", "long".... well, what are they compared to?
But in the overall argument, you are always going to have two sides of the coin: production vs. standard type. If you look at DP breeds, they are bigger for the reason of being dual purpose. If you want a big, beefy bird, you are probably going to sacrifice its ability to lay well. Likewise, if you go for the slimmed down version, you may get more eggs, but you won't have a table bird for any extras. I believe the standards for DP breeds is attempt at trying a middle road for both aspects rather than going all one way or the other with the exceptions of breeds like Cornish which are meat monsters (or should be), and the other end of the spectrum is Pearl White Leghorns who are bred to pump out eggs like a factory. But neither of those are DP breeds anyway, so the point is mute.
Would I be correct?