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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Smoke & mirrors again, boost people to 300 so they come back, with promises of easier levelling, then cripple them secretly. Regardless of anything they do now the content is old, stale, punishingly difficult, & simply not fun, with rewards not worth the pain & a system that makes it's harder the higher you level. Awful company, game has never been worse regarding simply day to day play.