New dungeons - inconsistent difficulty?

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That's the point though, nobody knows what to do on their first run in a brand new dungeon.

Good players do. They see a mechanic, and they figure it out right then and there. "Oh the boss turned transparent. Oh standing in this circle makes me flash light. Maybe I should run to the boss with it?". The way the majority of the things work in the new dungeons can be found out precisely as they happen.