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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The strike and crucible shaders are time gated. The reason why is because as you can probably tell...crucible and the strike playlists are getting a bit stale. When they start to get really stale that's when you'll see these shaders start magically appearing :).