It is pure speculation, and I'm looking for the positives, but a curved blade might catch more water in rough conditions and braking on the back of the curve might prove better than leaning on the edge of a flat blade - works on a ski but different strokes of course. Steering, leaning and braking on it would be different and would need some adjustment if you're used to straighter blades. Need to remember we're talking about a hybrid fibreglass/carbon paddle at a different price point here and a comparison to a top end paddle isn't 100% relevant.
The other positive is that it deters renters from using their paddle backwards up and down the beach - which has to be good for the sport.