He probably has plans to write her branch in time. He just wants her arc to feel whole so he's making her gender selectable for the female Wu heirs and adding more events after expo and before the tourney. If he does this for the next update, then Mei, Ai and Tigress would have relatively good amount of content. It's a start.
If you ask me, if he doesn't want to write RO content, then don't do it. I bet the discord is pressuring him. Ai had a good arc, Mei I haven't played yet but you guys clearly like it. It feels like he actually planned out their romance arcs compared to say Xiwen or Caihong.