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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The only people it's benefitting are the ones doing match made fireteam ops. Everything else is suffering. The only way this could benefit anything else is if the scoring is increased to accommodate no longer being able to overlevel. If we should be forced to do -30 on everything, then we shouldn't have to turn on any modifiers to get A tier rewards regardless of our level.