The shader system should be converted to the same system that armor and weapon mods currently run on. When you get a shader for first time, it's permanently unlocked and in your inventory, When you want to apply it, you just pay a small amount of glimmer.
I don't think anyone enjoys the laborious task of deleting huge stacks of shaders. This has been a problem since early D2, and I think the new mod system is a good template to fix it.
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They are not gonna change that because they want to give you the illusion that there a lot of stuff to do in this game. Endlesly dismantling the same boring shaders is such a great activity...lol. This game is just a boring chore with old recycled weapons en recycled dlc content which you allready paid for in the past. The best weapons are not obtainable for 95% of the players and with raids which are only do-able if you are in clan or play with people who exactly know what to do.