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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Its not and they know it, just spinning it as an improvement so they can still effectively slow your progress. They were obviously not willing to actually make the power grind faster, but were forced to make changes due to all the negative feedback and steep decline in player population, this is their way of evening it out since will take longer clear an activity on average with a permanent -30 delta.