How relevant is the chronology of the dusty journals/memories? I know most of them are self-contained stories, but not sure how much they reference previous entries.

I'm not sure if I should double down on Nikketa or Lynd, since I have invested hydro & corrosion teams, or spread the wealth into other elements. V6 Qiuhua is a bit too soon, but might be able to make that happen, her quick succession shotgun support attack is cool