FurtiveNyctophile
Sentinel
For those who followed the lore, they have mentioned a couple of times that the story of Baldur's Gate 3 follows chronologically the events of the Descent Into Avernus campaign. So, I don't want to spoil anyone, as I've fully completed the adventure with some of my DnD buddies, but that being the case, it makes complete sense for BG3 to begin and probably almost exclusively play out in Avernus.
I played this with my normal D&D group as well, friends & family; and wow did they not do anything that made complete sense to me. But we had fun with the campaign. It was a long one. They spent a fair amount of time in Avernus while doing the sideshit my group is famous for so it was maybe 50/50 actual focus on the written campaign... as per usual.