During the transition from the right stroke to the left, with your right hand fixed on the shaft remaining in alignment with your forearm, the shaft will twist a certain number of degrees based on your particular style. A low top hand in the low angle style uses a lower degree of offset to support neutral wrist alignment.
A higher top hand in the high angle style is uses more degree of feathering to keep your wrist neutrally aligned.
A paddle that is feathered to your style will be one that positions the left blade ready to take a stroke after the transition from right to left.
There are many strong opinions on why feathering is used.