I wonder if a lot of those hatchery americana are actually ameraucana with sloppy breeding, like some slw's having a recessive straight comb instead of rose comb.
Given the quality of other hatchery birds, I have often wondered why the Ameraucanas get singled out this way.
You can buy "White Leghorns" that may have some black feathers, "Naked Necks" that come in a mixture of colors, "Cream Legbars" that are not really autosexing, "Wyandottes" or "Hamburgs" that may show up with a single comb when it should be rose, and so forth.
But I don't see nearly so much fuss about "Naked Necks" needing a different name just because the colors are wrong!
Personally, I think "Easter Egger" works nicely to distinguish them from "Brown Eggers" and "White Eggers."
But that would leave us with no term for "has muff/beard and pea comb and lays blue/green eggs" (which is what hatcheries seem to mean by "Ameraucana.") And we do need a way to distinguish those from Cream Legbars, and Olive Eggers (often Legbar x Maran), and Whiting True Green, and various other chickens that do lay colored eggs but that are not even trying to look like an Ameraucana.