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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To be honest I enjoyed going in to the lower level vog and kf in d1 with my friends and just melting everything as it was a laugh and made us actually feel like god killers. Many online games manage to have a level progression that lets you feel powerful by having certain areas with low level, your level and high level enemies and quests so you can go back through an area and fell like a god or at least see how far your character has come. Sadly destiny has no structure in its levels/power all it does is unlock events you can play.