I was working on the Encore mission for the story progress. Bungie decides they want this mission "big" so it takes an absurd amount of time if you're going out of you're way to do the secret stuff. I finally make it to the final boss after over an hour of work and almost kill it, only for the servers to have a hiccup and I'm sent all the way back to the beginning.
This is absolute nonsense.
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Check points have been an issue with Destiny from day one Bungie does not believe in them as it gives too much control to the player and that has to be avoided at all costs when the game relies on grind.