I don't know, for me, I liked the way certain exotics or hell even legendaries looked. Your logic and technically bungies makes sense in a rpg element... but here I'd like to take a page out of borderlands loot scenario. If i got a legendary pistol I could find solace in the fact that when I did outgrow it I could always find a more powerful version of it later!
I don't mind diversifying my look when it's a choice I, the player, makes. But when it feels like I'm being forced into a change..especially for a game.. it just seems..distasteful.
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Borderlands ftw. Only thing i have to add is that at least in borderlands i didnt have to unlock that Guns capabilities. Granted, we get the "special" perk of the Gear, but i still have to unlock it the rest of the way through using it.