Yes I can explain this LOL! The reason for Freestyle riding is to 1) give the horse an opportunity to express himself in a very free kinda way, 2) teach the rider to use FOCUS, 3) teach the rider to have an independent seat and not reply on their reins/hands/legs, 4) to build confidence and impulsion in the horse, 5) to teach the rider to stay out of the horse's way, 6) to work toward the ultimate test of freestyle riding, bridleless!....I could go on.
It's important to ride Freestyle before Finesse so that, as Karen Rohlf says, "You ride Freestyle, inside the Finesse." Meaning all your movements and aides are so subtle, light and can be isolated independently that the only change is that you ask your horse to pick himself up and carry himself in a different posture....which increases the difficulty. And if you were to drop your reins in the middle of Finesse work, the horse would maintain gait, speed, direction, remain balanced and stay in emotional control and the rider would remain balanced, focused, and calm. Freestyle is SO important!