I agree, ascendant materials from a purple engram sucks. I would rather have the choice of keeping the weapon/gear or dismantling it myself. I would rather see materials drop from blue engrams then purple. At least then it is a surprise vs. a disappointment. From another perspective though, bringing up a fresh guardian you need all the ascendant materials you can get your hands on. A full set of vanguard gear is going to need 72 shards. I think even then i would rather get gear/guns from purples and a light sprinkling of mat. From blues with a similar drop rate as that of the coins/motes. Maybe bungie will consider changing that. Probably not but, meh be. The real kick in the junk is some of the rewards from the nightfall. They said they fixed the amount of materials dropped but when you see that one purple engram that you know will be 2 shards/energy, did they really fix that?