"Flaws" in this context means problems that either make them more human and relatable, or that cause real problems for them in the story and are treated as such. Edward and Bella are about as relatable as a pile of jelly. They are both physically perfect, and their pseudo-flaws are either hardly present (Edward's "overwhelming" thirst) or effectively an advantage (Bella's cute, fragile "klutziness"). Yes they are respectively abusive and shallow, but that is something observed by readers of the book and not acknowledged in the story itself. No one tells Bella off for mistreating her friends. No one calls Edward on his abusive behavior. In terms of the world within Twilight, Edward and Bella are seen as perfect as can be by the whole of the populace no matter what acts of stupidity, selfish