> I'm going to assume it's like all the other HTTP/3 implementations and fails to fully implement the spec... the lack of ability to use plain text or self signed certs

Really? Does trusting a self-signed cert as a root cert not work in most libraries? quiche at least lets you control the parameters of their TLS implementation (https://docs.quic.tech/quiche/struct.Config.html#method.with...), which lets you go as far as allowing you to manually verify certs yourself (https://docs.rs/boring/latest/boring/ssl/struct.SslContextBu...).