On my ship alone I'm aware of at least 3 groups working with multiple alliances under a single banner. I host one of these groups myself and in its current state alliance administration is difficult to say the least, but the largest problem I have of all is that we can't all fit into one group chat or alliance chat.
Please consider raising the alliance cap or at the very least the group chat cap in the near future! It's frustrating making friends with new people, but not having room on my friends list, in my alliance, or in my group chat to accommodate being out-going. Among the potential quality of life changes this one is a constant issue for this group.
This other post does a great job outlining some of the other improvements that could be made: https://forum.pso2.com/topic/3418/alliance-overhaul-needed-collaboration/18