[phyrrus9]

Usually you use public key to transfer the symmetric key for the encryption of messages like in SSL. Asymmetric keys are not designed to be used for constant encryption and decryption due to their poor performance in speed.

It's nothing about design and all about security. If you've got to use public key encryption in the first place why not just use public key encryption for the whole system. I find many python programmers tend to overlook these things

Maybe you're trying to defeat quantom computers?

Seems like a waste of cycles to me...