I do think this is an area where removing BITF was a mistake, for both PCs and NPCs, like Vulnerabilities that have been mentioned they’d be able to highlight where a character might be prone to being tempted or stand firm on certain subjects, players get to stake their claim on specific aspects of their character’s identity as important, so, if the character, to use a previous example, has the trait: vow of celibacy and seduction attempts aren’t going to go anywhere but that also means they’re going to struggle if they attempt to charm their way with someone else.
And with NPCs this gives them specific topics that they can be convinced just by a good argument without a check, or get to resist being vulnerable to a skill check to flip their worldview.