Rudders and skegs imply very strongly a need for rudders and skegs. If we include the paddle as rudder or leeskeg then 'all' craft use skegs/rudders exceptin' specialized craft used or designed TO NOT use r/s for specialized reasons for example perceived aesthetics.
Learning skills toward paddling with great balance, perceptive intelligence, and efficacy is effectively done with interval training. Intervals against the wind often simply given by rudder/skeg control.
Forcing learning without intervals is not aesthetic.
Dependence on rudder skeg exclusive of learning toward is a special case certainly not a foundation for r/s discussion. You see this point, no ?
The shock cord fix works.
I am surprised finding - in a search done before posting here - paddlers expecting less drag from skegs as the skeg intrudes into a less turbulent area than the stern rudder at what may be the most turbulent flow area.
RUDDER UP !