Right now you can run ultimate for tier 5 loot at A or even A+ at a delta of 0 or even +10-20 if you are smart with the customise option for the modifiers.
So how is forcing a -30 delta at all times supposed to be making it easier?
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Bungie is progressing, they at least posted a contract role for game tester. So assuming someone at Bungie will actually play their game sometime soon, I'm hoping feedback gets passed up the chain forcing power deltas is a nerf and removes even the slightest incentive to hit 450, 500, 550, etc. At ~480, I can run an activity at power and still get T5s super quick and in a casual way, which partially justifies the aweful grind while reaching this stage.