Just like the title says, I feel this would skyrocket the amount of customization and creativity available to players, and while I am no developer, I don't think this is a particularly difficult change to make.
For example, I saw an excellent hunter set taking advantage of the dark/pale green and black in the refurbished black armory shader. I wanted to replicate this on my titan... however despite my best efforts I could only get black and red (while yes this is what the shader is intended for; it just wasn't what I was aiming for).
As always, love you Bungie, love your game.
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I believe shader application is based on material groups within the game, hence why you get different results depending on the class, but yeah would be cool. Might see some wacky stuff running around though if I can put the blue part from neopop wave all over everything heh