Importantly, this could mean that rather than [No attribute] magicians being unable to use magic, it's more likely that the type of magic which they are able to use simply hasn't been discovered yet due to a lack of [no-attribute] magicians.
In that case, there could be many other attributes other than the 4 elements which are simply undiscovered.
Maybe.
My only basis is from observing Noel. I want to investigate further and confirm.