Private key not created by Yubikey

[curiouspython1]

Why does the program create the private key rather than request the Yubikey create it? As I understand, the Yubikey itself has the capabilities to generate the private keys in the firmware.

yubikey-agent/setup.go

Line 149 in 2e5376c

priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)