Regarding non-reliable streams: There is https://tools.ietf.org/html/draft-tiesel-quic-unreliable-streams-01 https://tools.ietf.org/html/draft-tiesel-quic-unrel

Regarding non-reliable streams: There is https://tools.ietf.org/html/draft-tiesel-quic-unreliable-streams-01 https://tools.ietf.org/html/draft-tiesel-quic-unreliable-str..., while it won't be part of the initial standard, it's likely that the working group makes sure that it can be added later.