As a user of QUIC, I've found it to be pretty much everything I've been wanting for the last 20 years. Hopefully WebTransport can grow the features required (e.g. by stealing them from WebRTC) to make real P2P WebTransport possible.
Edit: if I'm reading this correctly, then maybe there are already efforts underway to make this possible: https://github.com/w3c/p2p-webtransport