Why doesn't OpenWrt be the first OS to natively support DNS-over-QUIC?
Already working see DNS-over-HTTP/3 - #24 by nihilt
QUIC is a horribly complex protocol to implement, requiring rather large libraries and forced cryptography to deal with it, making it unsuitable as default choice for weak devices.
Is it possible to make it a optional choice for routers that can handle it?
It already is optional see my previous post