But in protocols such as TLS or PGP, the computational requirements of RSA means it is often just used to encrypt a symmetric key, which is then shared with the

But in protocols such as TLS or PGP, the computational requirements of RSA means it is often just used to encrypt a symmetric key, which is then shared with the recipient, in a very similar way to how DH is used to establish a shared secret. I wouldn't say that conflating them in this way is so unrealistic.