Sorry but no. Not solved.
They also have a newer post about 0-RTT and how QUIC makes it even faster.
https://blog.cloudflare.com/even-faster-connection-establish...
That only applies to cloudflare’s implementation of 0-rtt. That isn’t a general restriction.
Additionally 0-rtt isn’t the only rtt optimization in tls 1.3.
Either way your original point was moot since http keepalive is sufficient to avoid tls connection costs for serial requests.
Sorry but no. Not solved.
They also have a newer post about 0-RTT and how QUIC makes it even faster.
https://blog.cloudflare.com/even-faster-connection-establish...