If you ever wonder what different types of wing motions are good for, look at birds. They use all of them.
In this case it reduces lift while keeping drag the same. Birds use this when landing. It also adds dihedral.
For our much larger aircraft, we use spoilers due to scaling issues.
Many, if not most or all, motions involving the entire wing can be used for control in place of things like elevators, ailerons, flaps, spoilers, and rudders. But they have more value at smaller scales where structural scaling causes strength of materials to no longer be an issue and where aerodynamic scaling causes the conventional control surfaces to be too small.