I don't understand this -- do you mean you wouldn't have them because you wouldn't have thought to characterize your PC in that manner? I guess, if it's a prompt to you, that it's doing some good. My tables have had these kinds of things since I started playing -- ties to community, personal goals, character flaws, etc., so a prompt to add detail to your character isn't a strong selling point for me. You could just say "think about how your character acts, what personality traits they may have, who or what they believe in or are beholden to, and what, if any, flaws they may have." Single sentence, does the same work.
Again, the mechanical side of BIFTs isn't anything more than previous editions' recommendations for roleplaying XP.