So far, Power level has only been a glorified progression gate, slowly allowing you to not be too weak in certain activities, but beyond that (from what I've learned) you gain no advantage when your power level is over the minimum requirement.
Is that still going to be how power levels work in Forsaken?
Edit: I don't think we should steam role night fall or raid bosses (although that would be fun near the end of a season), but being 10+ the minimum requirement should have noticeable impact without having to bust out a calculator and carefully measure each damage number to figure out the advantage. You don't want us to over power an activity too much? Set the requirement really high. Easy peasy.
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Didn't Bungie mentioned that if you are over the minimum level you can gain a 1 power level improvement in damage and resistance. Did not exactly state what the 1 level meant percentage wise however. There example was you are 60 higher then the minimum of the raid and the rest of your fire team is below the minimum. You will be a able to help them because of that 1 power level advantage to help compensate for their lower level.