I could see having 3oC in D1, where exotics were a little more rare, and you could use exotics for infusion, to level all of your gear up. But even that was kind of "iffy". But in D2, exotics drop from everywhere, and they can't really be used as infusion fuel. I did however find the new engram that Xur sells to be useful. I was able to finally get a Telesto from it. Maybe I'll be able to get the Crimson next week?? There's really nothing else to spend my shards on. I might as well use them to get the last few RNG exotics that won't drop for me.