Easter Egger is often a catch-all term for any chicken that has the blue egg gene but does not belong to a specific recognized breed.
Some such chickens do have feathered legs and feet, depending on what is in the mix. For example, some people breed Silkie-mix Easter Eggers or Cochin-mix Easter Eggers.
If the chicks hatched from brown eggs, we know the mothers did not have the genes for blue or green eggs. If the breeder was trying to keep the different kinds separate, the hens were probably with roosters who did not have those genes either.
I agree, there is a strong chance that these chicks will not have the genes to lay blue or green eggs.
Nothing wrong with breeding barnyard mixes for the fun of it, just don't expect the chicks to look like any kind of purebreds.
But if the goal is to have chickens of specific breeds, I agree about not breeding from these chicks. One sort-of exception, if there are no better breeders available, it may be possible to start with these birds and breed toward good examples of those breeds. But that would be a very long project, not something that most people would enjoy, and not worth the effort if there is any chance of buying better birds of those breeds.