It'll be slow going at first, but as you increase your light level, more options to acquire them will come available. It's a curve most good rpgs follow, and very similar to the model in vanilla.
Just because it's not like HoW doesn't mean it sucks, just mean you actually have to put in some time and effort to reach to tier, as it should be.
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The progression here is like a parabola. The progression in vanilla prominently featured a brick wall.
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But bungie them self said the progression path in vanilla sucked they keep changing it, I also hate the fact 99% of the quests give you nothing but xp which once your subclass is maxed and your lvl 40 you don't need
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Xp goes for gear too, so yes you need it.
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still needed for weapon/armor upgrades