Also, as a side note:
I have no experience with DnD so far. I knew Tieflings were a thing and not (necessarily) bad, but that's about it. Yet, I didn't question what was going on in he game at all. I also feel it's handed to you pretty straight forward... The leader talks to you right away about how they are refugees from a war in hell. Later on, I can find letters that talk about more hoards of refugees (in the toll building). ( I may mistake two different issues for one here, but I don't think it's relevant to the point.)

I don't understand why I need to know everything related to a plot before I play a game? If a completely new game (with no related franchise) threw information like this at me, I wouldn't be confused as to why I didn't get further information on a conflict beforehand. I would try to find out more about it by playing the game. Do you?
Therefore, I am against a prequel summary at the start of the game. The cutscenes at the start of the game are more than long enough as they are. After all, I want to PLAY a game, not watch a movie before I can get started.