Taking the right approach?
I've been playing for a few weeks, and I try to read up as much as possible, and came across someone saying the galactic war enemies were based on your top 5 characters. So, I took it easy on powering...
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Nothing wrong with hoarding gear. If you are completing GW, you can sim it after you have beat it manually a number of times, I think it is 50, but I really don't remember. Once GW is simmable, gear and star up and move to your next objective.