This is so damn funny.  The DBBB is not a whit more complicated than the F.-8.  It's just as safe, it's easier to untie after being weighted, it's compact, you'll never accidentally pull your not-fully-untied knot up to the anchors where it will then create a huge clusterhassle for you, and you're not likely to leave it half-tied and just hanging through your harness while you get distracted by something else. 
  
Indeed, why change a good thing?  Because there's a better thing to change to.  Sheesh!  
like i said bulk up those finger muscles! 
also don't get so distracted and pay the fuck attention and you won't forget to finish tying your knot.