As I said before, Mages are simple but not easy, and a new player will struggle with controlling the pet and having zero CC options. That will inevitably result in a lot of frustration and deaths early on that could easily lead to them quitting. The Druid is just much more forgiving for a true newbie; having snare from level 1 alone will allow them to escape a ton of deaths early on by running to guards. Then add in heals, root, harmony, invis, SoW all by level 14. With all those tools in the toolbox, even a totally new player can level very safely and contribute to a duo.
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