It lends an answer to colors that don't have that answer
Exactly. And that's why it shouldn't be printed; the whole point of the colour wheel is that not every colour has access to every type of effect.
I wouldn't mind an artifact that had a _different_ solution to enchantments, unlike the white cards we already have. E.g.
Wirebound Nullstone
3
Artifact
1: Counter target enchantment spell unless its controller pays 1.
1: Counter target activated ability of an enchantment unless its controller pays 1.
I think that's a reasonable effect.