Please consider occasional rank down tickets
Over time, rosters evolve as people acquire new champs and change masteries and preferences and play styles shift. It would be great to have a way to tweak rosters by ranking down characters on occasion. Perhaps one 3*, 4*, 5* rank down ticket per event quest? Or even if we could pay units to re-spec? Especially with the shift to 5*, people's rosters will shift and it would be great to reallocate resources we've already earned. This might also encourage more experimentation with champs and a more diverse gameplay experience. (Lots of people did creative ranking and testing during the 12.0 debacle!)
Also, its high time that 100% of master mode provided one t4cc crystal