I've been playing nearly since the start of Tacticus and so I have just about every character they've released. I'm more bottlenecked on Orbs and Books than I am shards. The community choice banner was so underwhelming/not aligned with my choices that I skipped it.
For veteran players is the current or upcoming banners interesting to you at all? I have a slate of mythic characters or characters in mythic progress(Lavistodes is mostly mythic, Psyker and AdMech have characters going through missions). I just have so far saved up my breqs and am reluctant to use them on anything where I wouldn't have a chance at good value.