[genuineDSD]

You are right. And it'd be absolutely irresponsible to expect _everybody_ to drop things on the floor and adopt a new protocol (implementation) over night.

However, it'd be equally irresponsible to ask for an innovation budget of 0 percent. The reason one bothers with new approaches is, of course, that fixing things on a conceptual level prevents many of the debugging sessions that you had to go through with the old approach. Why QUIC if there is TCP/TLS/HTTP?

IPv4 and NAT are literally _everywhere_. It's tested and well-understood (one would think). But—and that's just my opinion—I sure hope that, one day, we will not have to deal with that mess no more ...