Agreed, if you played Decent into Avernus it's much more clear but relying on people playing BG3 to know this is not a good design decision, Baldur's Gate 1 was released in 1998, I don't have to know anything about what was going on in the Forgotten reals 22 years ago to be able to get into the game, let's make the same true for BG3
I'm not 100% up to speed on D&D lore(nowhere near hahaha). I have the Decent Into Avernus book, which I bought to run as a DM for my gaming buddy I plan to play BG3 with(as it's a prequel). I'm going to have to read through and learn about the whole Tiefling ting.