I'm too tired to go back and try to do a multi-quote with all the applicable posts so I'll say list a couple things here and assume y'all know which ones they apply to.
1) The egg chart referred to is a product of the ABC. It's has nothing to do with the APA SOP and I would be willing to bet a pretty good sum of money that most judges have never even seen one. So using the egg chart to determine if a judge should DQ a bird is irrelevant. In fact, if you look at some of the colors listed on the ABC Egg Chart, they are green. While there may be some truth the the idea that some folks eyes will see various shades of the same color, the chart obviously shows various shades of green - not blue. Ergo, for one to hold that an Ameraucana MUST lay a blue egg or it is not an Ameraucana and thus should be DQ'd at a show if it laid other than a blue, is ridiculous.
2) As I said previously, egg color is only mentioned under the "General Breed Characteristics" in the SOP and there is NOTHING on a judges score card that deals with the eggs so judges aren't going to be giving any consideration to what shade of color an egg is, how large it is, production rate, or any such thing. The reference to "lays a blue eggs" is simply a "general" characterization and is not intended to be specific as evidenced by the fact that it is not a trait a bird is judged on. Not only that, but even in those cases where a specific trait is listed on a judge's scorecard and awarded a certain number of points, there is often some room for a fair degree of subjectivity with regard to that trait.
3) Given all the different traits and genetics behind those traits that it takes to get within the breed standard, it's pretty unlikely you're going to get an EE that looks like an Ameraucana in all the required areas and lays a brown egg.
4) Folks on here might want to do a little bit of talking with some of the founders of this breed and long time breeders about egg color and what true Ameraucanas can lay before they go about telling someone they're cheating or "faking". Not only that but I've personally witnessed EE's being entered into a show by someone unknowingly thinking they have an Ameraucana because "that's what the folks at the feedstore told me". Telling them they're "cheating" or "faking" does NO service to the Fancy. Moreover, I've also witnessed two different judges score birds and they didn't know the difference between an EE and an Ameraucana.
5) I don't remember who it was that said they were going to relegate one of their Ameraucanas to the EE pen because it laid a green egg. IMO you're doing yourself a disservice if you make egg color a priority over many other traits that could and perhaps should be given priority. The brown can be eliminated from the egg while working on other things with the bird as well. I know because I've done it. There are, in fact, some approved varieties today that I understand from those who are breeding them that still lay a pretty green egg.
God Bless,