Well, after nearly three years of being enthralled with the campaign version of this game, I think I may be in need of a break. Over time, the game has lost its level of "fun factor" for a couple of primary reasons:
Campaigns no longer competitive
Initially, when I was new to the game, it seemed like I had to work for a victory in each mission. However, the way that I tend to play games that I enjoy, I can't help but do lots of research in order to min-max my abilities and play style. Over the last 6 campaigns that I've completed, in missions where I did not intentionally decide to lose (I intentionally lost 2 missions in my most recent campaign to maintain Rebel morale), I'm a combined 54-4 win/loss ratio. I do not state this to brag about it but to highlight the one-sidedness of the campaigns that I've played (3 times as Rebel, 3 times as Imperial). In fact, across all campaigns, six of them have seen 0 or 1 win from one side of the table or the other. In the finale of the most recent campaign that I completed, I tried to play in a way where the outcome of the mission would be extremely close. This involved applying handicaps (allow Rebel respec, remove agenda cards, reduce threat level by 1, remove banes) but even after all of this, I had to "forget" about certain abilities, intentionally make some less optimal moves, and provide occasional suggestions to make it come down to the wire. I think most of the Rebels had more fun this way but it wasn't particularly fun for me.
Lack of variety
Maybe this is a result of overplaying the game (I've completed 11 full length campaigns more or less) but things have gotten a bit stale. There are only so many ways to structure missions and they often play out pretty similarly. At a macro-level, the same is true of the campaigns overall. Rebels tend to buy the same upgrades, it's generally understood what the "better" heroes are (and no, we don't always play only the best heroes).
With all that said... the game was a lot of fun while I played and I really did I enjoy most of the campaigns that I've been involved in. The game itself has some good mechanics and I love Star Wars so there's always that. I will probably still join one group if they start up another campaign in a few months (just to hang out with the group), but I think it's time for a break. Anyway, just wanting to share my recent conclusion.