No? I'll just link against one of the cross platform libraries that implements it, the same as for any other networking protocol. (Ex https://github.com/microsoft/msquic)

Also see: https://github.com/quicwg/base-drafts/wiki/Implementations

> same as for TLS, making fewer apps implement it without a lot of extra work

... do you not just link against a relevant networking library at this point? If not, why?!