Was it hard to give us OG Fallen with the cool armor from Destiny 1 with some interesting House of Rain colors instead of just saying that the House of Dusk stole the colors from House of Rain but still look like Destiny 2 desperate Fallen with their Armors?
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The development time for any project is determined by the things they can get done and the things they cannot. It is fine as an example or it might be a step into us seeing one thing, drawing a conclusion, and finding out otherwise. It's a good stabilization point too. Too much change brings about when changes occur, why was the lore updated this way, and others.