The issue with colour coded items I find is really quite simple; they seem to be associated mostly with action RPGs and MMOs
So ...
Basicaly "i know it from here and it reminds the that, wich i dont like" ?
Feel free to corect me, if i read it wrong, im just trying to translate it.

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I for one kinda agree with snowram on this one, its just graphical mark of something that was part of this game since ever.
On the other hand ... i must admit that i never really understand this kind of mechanic (uncommon/rare/very rare/legendary) at all ...
I mean:
How is
Worgfang "uncommon" ... does that mean that someone have strip production for Daggers specialy enchanted to fight Goblins? And that there is litteraly hunderts of them in the world? O_o
And if so ...
How about Sussur weapons?
WE created them, they are basicaly first prototypes (or at least that is what i get from that quest, maybe im reading it wrong) ...
But presuming that im right ... why is
Sussur Greatsword only uncommon ... meaning (again if i get this right) that they are "not that special after all" ... but
Sussur Dagger is rare ... meaning one-tear more rare than 2H Sword ...
Even tho we just made one or another, and unless i indeed read that quest wrong, they are both first-of-their-kind. O_o
I mean how can anything that is one-of-its-kind, something quite unique on the world even be uncommon or rare?

Isnt its uniqueness contradict to both? O_o