Exactly, and that's my point; if Larian is going to devote the majority of their resources to the custom characters, then their advertising of the game should reflect that. Let players know that it's a game where you play as one of a selection of pre-made characters OR a blank slate character you make yourself that has no real story before the start of the game. In contrast look at Dragon Age: Inquisition. You don't play out your background in that game, but you get a whole line of off screen inquisition missions that involve people from your backstory and you get numerous opportunities to talk with your companions about your past. Something like that for BG3 would be amazing.