I know you might say "Nothing can be done" but for gods sake it took me a long time to collect the motes and I finally can afford something from Xur. After decoding the engram I receive a helmet for a Hunter. I've only ever used a Warlock so this has not only become useless, I can't get my motes back. I can prove this with a screen shot. I am sure I can't be the first one with this issue but I can tell you this made my experience take a turn for the worst.
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Bought 7, yes 7 engrams. Hoped I would get Obsidian for my warlock. Nope. Drops as follows: 2 x Insurmountable Skullfort 3 x Mask of the Third Man 1 x Saint 14 1 x Glass House Opened all on my warlock.