Because you then need longer and heavier landing gear, which you need to fit somewhere in the plane as they retract. This is a ripple effect where you probably

Because you then need longer and heavier landing gear, which you need to fit somewhere in the plane as they retract. This is a ripple effect where you probably need to redesign the complete airframe, from fuselage to the wings. They actually cleverly modified the landing gear to gain a bit of heigth, but it was not enough: https://youtu.be/F4IGl4OizM4 https://youtu.be/F4IGl4OizM4