So maybe I'm missing a key point here, but if you have to unlock the exotic in your collections to focus decode it, which would allow you to claim it with legendary shards, why would you waste two exotic engrams and an ascendant shard on focused decoding exactly? Cause I don't see the point. I could see it if it would allow me to narrow down what I am claiming to be in the pool of the item I want, or allowing me to get the exact exotic I want, but if I can't do either of those and can only either go RNG or claim from a pool of items when I have that entire pool, why would I not just RNG?
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You're misunderstanding the currency cost and the purpose of exotic focusing. The green numbers are what you have in your inventory, meaning you currently have two exotic engrams. The white number is the cost, which is 1 exotic engram. The Witch Queen engram you are hovering over does narrow down the pool of exotics you can get. You can also tab over to another page on the focusing screen to pick the exact exotic you want to focus that you have obtained before. The reason you wouldn't just leave it up completely to RNG is because you would be randomly getting an exotic from all five years of Destiny as opposed to focusing a Witch Queen engram with 5 exotics. Did that make sense?