I think that anyone who wishes to enhance his or her flourishing should do some sort of exercise(s) for their fingers/hands.
I've done card magic on and off for about five years, and just got into flourishing recently. The finger exercises in The Trilogy have increased my packet control by strengthening my fingers and enhancing my finger dexterity.
I do the exercises for 10 minutes straight when I wake up, and then I have smaller sessions throughout the day, whenever I take the time (usually before I pick up my cards, if it's been a few hours since I've used 'em.) Of course, if you've been flourishing for a while and are pretty advanced, I doubt you'd need to do the exercises this many times/this often.