I don't learn so good under pressure. Explorer mode would make learning more accessible. I really liked the idea of being able to see all the dungeons and learn them at my own pace. Then I work towards a level of knowledge where I could confidently farm the normal dungeons with PUGs.
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Its nothing new, Bungie does something that the casual player likes, either intentionally or accidently, It either immediately gets fixed/nerfed/removed. "Gotta Keep It Sweaty" - Bungie.