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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I am pretty sure they laid off the people responsible for those modes. Hence why we are not getting anything like that anymore. I could be completely wrong and the new dungeon could implement it. We shall see.