So, I didn't notice until now, but since the update, you can only be a member of 10 groups, but follow as many as you want (I assume). The problem is when I'm already a member of 15 groups, and would have to leave 6 groups just to join a different one.
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Yeah, other people are hoping to get this changed back as well. Until that happens, you did the right thing by leaving Feedback, so Bungie knows more people would like the number increased.