Tailless design is not such a big deal that it can not be in service in tiny drone form before huge fighter jets are in service. Its just a less explored form of airframe design. Infact, i think it makes sense that China likely developed the drones first, fine tuned how the control system of these tailless designs work in smaller and cheaper form factor and then went ahead to build the big fighter jets.Then going by this logic, the 6th gen CCA displayed would already be in service!![]()