I'd like to add that while my feedback of the key event unfortunately remains very much the same after several more days of it, that I have been enjoying the Survival Trial event this week.
I don't know if it was a change based on feedback from the arena event in the previous week, or if it was always intended for this event, but it's definitely appreciated having those repeatable missions everyday. Rewards aside, because there will probably always be someone who will want more, but I personally think it's a nice bonus and feels pretty good to have something else to accomplish each day. Hope we can see more of this type of thing in the future, and for me the arena event would have also benefited from a similar structure.