Counterpoint: All the origin characters have bespoke side stories and dialogue, and one of them is a chaotic neutral rogue who is also a bisexual vampire twink.
(Given Sven's advice here I'm probably just going to go with a drow or tiefling warlock, but Astarion is absolutely on the table for the second playthrough.)
There are quite a few reasons. New to DnD or RPGs, want to just get into the game, want to experience the cool backstory for each origin character are a few I can think of off the top of my head.