Why is gear still "unique"?

[Andevom]

I assume the point of making them Unique is so you don't roll Need on items you already have, allowing other players a chance at getting them.

That makes sense for raid gear at least, but not tomestone gear which is purchased.

[Kaecilius]

That makes sense for raid gear at least, but not tomestone gear which is purchased.

Yeah, that's a good point. They could always add a new rarity tier for tomestone gear if they wanted to address it, at this point it just seems they share the Blue rarity tier properties.