I understand the optimization curve you are talking about. But, my coffee and I think my answer is more accurate as the theoretical asymptote as you reduce certificate lifetimes... you can never really have a zero lifetime certificate in a TLS connection, but you can reduce it to the handshake sequence necessary to establish the connection and its authenticated symmetric cipher.

Yes. But the point is that isn’t going to happen. It would directly undermine the goal of eliminating the stability and scaling issues with OCSP.