I think, other than the fact that it sounds like you got pretty lucky with your rewards overall, you have to also consider the fact that all of these things can be obtained during the frequent events, especially the larger seasonal ones, and that on the whole none of those are particularly impactful. Individual SoKs are not game-changing in the short-term, rogue hideouts are far less useful if you don't also own Alcatraz (which again is a long-term benefit as the unattached troops pile up), and set pieces are very much less powerful without the complete set, which again is going to take time to acquire if exclusively through DCs especially when you may be looking to complete an entire set and DCs are very likely going to provide repeat pieces before you get all the unique ones.
Again, I'm still not really seeing the impact here. If the length of time was extended to something like a year, sure, you could say there's a big gap then, but it simply hasn't been long enough for that to be the case. Much ado about nothing, if you ask me. This is a game that can be played for years; a month isn't going to make or break anything.