Absolutely awful. Still no improvement from year one on these. Over 3k hrs and 4700 grimoire but I have a better chance to slay a Black Unicorn then to get a shader drop from anything.
Edit 1: I have noticed that shaders show different ways to obtain them based off whether you're in the app or online at bungie.net. For example lion dancer. App shows it is obtained from defeating Crota in Crotas End. The website says cryptarch packages. There are several more.
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Dude the only problem is the -blam!-ing cryptarch- I got every shader in yr one so since TTK has dropped I have received zero because they are time gated or whatever - it's -blam!-ed up