The more someone relies on a control hand, and the more dominant their dominant hand is when they paddle, the more asymmetrical their stroke. The reason having a control hand is still around is because people have a dominant hand and it feels natural for that hand to do most of the work.
There have been a few studies of Olympics level paddlers that looked at power output for each side of the stroke. All the paddlers in the studies were right handed and all had significantly more power output on the right side of the stroke. As you would imagine, there needed to be a counter force to compensate. Most of the paddlers subconsciously modified their stroke asymmetrically to compensate for the more dominant hand. It is not that the concept is hard to grasp with the mind, it is that the concept is easy to grasp with the hand.
When using a feathered paddle the ergonomics are asymmetrical, it may feel more natural, but it is not balanced. In fact, there is no study that proves an ergonomic advantage to feathered paddles.
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