LaBella, Thanks for your comments! Cream is an interesting color. While it is diluted gold, when you combine it with double barring it comes out looking close to silver or at least off white. Without the extra dilution it would look more like the cream you were describing. So why can't we call it silver or gray?
We can't call it silver or gray because it isn't genetically. A true cream bird, when bred to a gold bird, produces all gold offspring. A true silver will not (silver cock to gold hen would produce all silver offspring, other way around would produce sex linked chicks).
Why do we want to breed Cream Legbars to look cream/offwhite/silverish? Because it's the standard, not a preference. Quite simply that's the way it is. Punnett was most likely the president of the Poultry Club of Great Britain when the standard was written and approved. He may have written it himself, but he definitely approved it.
You are of course correct that breeders can do whatever they want with their birds!!! I actually hope that some breeders keep the golden colors going, whether it become a variety or not, just because they are beautiful birds.
BTW offtopic, but I wrote in the tail angle at 45 degrees above horizontal based on the APA Leghorn and Plymouth Barred Rock Standards. If specified in the standard as above horizontal, then it is above horizontal. If not specified, the angle is measured in respect to the angle of the back. This is open to discussion, but perhaps we should move it to the SOP thread