Yes, that's correct. Basically the only good way to have a "first contact" fast track setup like this is by priming in DNS. My point is that the situation is th same for TurboTLS and QUIC/H3 in this respect.
I just meant that QUIC/H3 is beneficial even after you already have a connection, so upgrading an existing connection is a valid strategy. TurboTLS is only beneficial for establishing the connection, so it needs to have prior knowledge about the support to be useful at all.
