there is a thread for good ideas like this
I think likely at some stage. Snowboards, skis, skateboards, surfboards, bicycles all have highly engineered flex patterns in carbon.
I think at this stage it seems unlikely the mast will be the point of flex.
Loading and releasing through carves as the most obvious value of flex, like a surfboard or carve skateboard.
The other use is dampening of rough conditions, like a carbon bicycle front fork
Much more likely that the foil itself will incorporate some give to enable this. Somehow I don’t think the gear is mature enough to find much value in engineered flex