The rollout of Season of the Deep came with the side effect of making it impossible to change shaders via the API or Destiny app. A message is shown instead saying that action can only be done in-game. This is a pretty big regression that prevents some loadouts and style management apps from working correctly. I assume this is not an intended change. Some confirmation of that from Bungie would be very helpful. I am a developer who made an app specifically for the purpose of managing shaders and this issue has rendered it useless for now.