Airlines don't want rigid wings that can hold their shape in the worst turbulence. This is because a flexing wing acts as a spring and reduces the sensation of turbulence for passengers. Looking it in a different way: by flexing, the wing is absorbing a part of the turbulence that you are not feeling.

Airplane wings are designed to be flexible for both structural integrity and passenger comfort. This flexibility is a deliberate engineering choice: a wing that can bend is much more resilient to the stresses of flight than one that is rigid. When a plane encounters turbulence or sudden gusts, the wings act like the suspension on a car, absorbing the energy of the impact by flexing upward and downward. This prevents the forces from being transferred directly to the fuselage, which would make the ride incredibly bumpy and potentially cause the airframe to crack under the strain. Modern aircraft like the Boeing 787 Dreamliner and the Airbus A350 use advanced carbon-fiber composites that allow for an even greater "wing flex" than older aluminum wings. During the certification process, wings are "torture-tested" to extreme angles that far exceed anything they would encounter in real-world flight—often bending up to 25 or 30 feet at the tips—to prove they can withstand the most severe conditions without breaking. The sight of a wing bending might be unnerving to some passengers, but it is actually a visible sign of the plane’s safety and engineering.