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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That would require them to do a little extra work and yeah you as well as I and everybody else here know that that is a no-fly zone for Bungie... But like somebody else said down below limited revives!! what fun!!!