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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There's 2 things that must be at play, and both explanations are bad; 1 - Deliberate Nerf They are consciously making the game more obnoxious but DMG is gaslighting the whole community by telling us Deltas are better for us. 2 - Lack of Awareness They are so out of touch with how their own game works that they genuinely believe Deltas is better. Whichever one of these is true doesnt really matter, both are equally as bad.