To be quite honest i think a big issue the AE has is that they make characters "take turns" when it comes to participate in the plot of a planet, it doesn't feel like a team giving their all to support each other but instead taking shifts in a job since there is always 1 or 2 characters left on the train not even doing the bare minimum level of support work from over there.
To this day i barely know anything about Himeko or Welt, it took us 2 years just to begin to know more of march and that is still on going.