There is no point. You either run it for fun or do the higher level activities for higher level gear. Is that so hard to understand? Its how every game with progressive loot works
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So you would have no issue removing all of Vanilla Destiny, Dark Below, and House of wolves for the sake of progression? The game is barely there as is, and you want to make more of it useless? Why? There is absolutely no reason to render so much content obsolete for the sake of some shiny new trinkets.