RFC 8784 introduces a staightforward mechanism to use a pre-shared key to make modified IKEv2 key agreement resistant to a quantum computer Shor algorithm attack- thus providing a "quantum-safe" infomation channel. One use of this information channel could be to share keys.
QKD authentication requires a PSK in order to be quantum safe. And then can provide a quantum safe channel to share keys.
Both RFC 8784 and a QKD solution depend on a pre-shared key that has not been compromised. What tangible benefits of using QKD solution versus using RFC 8784 if the objective is key sharing over the channel?