There are many points to public key cryptography. The important ones enable new capabilities, e.g. communicating with a counterparty that I’ve never met. But it

There are many points to public key cryptography. The important ones enable new capabilities, e.g. communicating with a counterparty that I’ve never met. But it also comes with downsides as you’ve documented. Generating a new key pair is a moment of work and eliminates many of those problems.