It’s even possible that aspects of Fantastic Beasts and Where to Find Them that we didn’t realize will be important will become so in The Crimes of Grindelwald.
Having the general storyline of all five movies more or less planned out in advance at least has the potential to make the movies themselves better.
We’ll find out next month.
If you want to foreshadow events that will happen later in the franchise or simply make sure that continuity holds together, that’s much easier if you have a clear idea of where things will be going.