I'm still early in the end game/post-20, but using 10 legendary shards to pull an exotic from the vault is a poor investment, correct? I have a 155 Sunshot that I want to level up, and the vault collection has a 205 that I apparently need 10 legendary shards to grab.
Also, using legendaries to infuse (if available) make a lot more sense than using 4 shards to infuse a rare blue, correct? Is this an overcharge for convenience or something?
I've read in this thread that Xur will take legendary shards so I'm not spending any of mine until next week when we know for sure and how many are required for him.