We designed a product to be usable in all different learning steps and styles.
Shortly (you can find lots of posts on the dynabar matter):
1. Water start
Sliding hook can be easily controlled by twisting body in the direction you are going.
Body drag easier, no worry to loose board. Easy walk on the beach and less loss of energy.
2. Going upwind
Helps to keep optimal weight distribution and gain upwind ability.
3. Learning freeride tricks
More body freedom and easy transaction to toe side and viceversa. Allows both direction sliding, other brands don't.
4. Using directional board and wave riding
More body freedom during jibe and tack. Better legs load distribution
7. Foil board
No need to jibe
Add fixed hook and go, or learn how to hook back with two hands, one keeps bar and the other hooks back.