BG3 very much feels like it was made with more complex morals in mind and the simple evil vs good play-through isn't the most ideal way of playing the game. It has a lot of flexibility to be able come to terms with different play styles and decision making processes.
I'm not gonna argue for alignments, which is why i chose to put "evil" in quotation.
But there's no flexibility. You're either a hero who is friend to everyone, or you are a pariah loner who barely gets content. It's not complex morals. It's "be a good boy and get friends, be a bad boy and get nothing".
True evil character should be able to scheme, coerce, to become a cult leader, to side with absolute, to be something other than a murderous pawn.
I saw complex stories, and this one is as simple as it gets.