Because that's not how it is and you sir don't make the game. And this isn't world of Warcraft.
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Then tell me, have you never picked up a Rare armor piece and thought it looked nice? Have you never looked back at your year 1 armor, especially the ones that aren't available anymore, and wanted to wear them without it dropping your light level? Where is the harm in letting us fully customize the appearance of our Guardians?