Having to write your app to understand that TLS 1.3 was used, and 0RTT was used, seems like a really really bad idea. The longer I'm in engineering, the more I realize that the number of people who understand the ramifications here is much smaller than the number who can throw together a TLS 1.3 listening HTTP server by following some dude's tutorial.

Framework support is not going to be enough. This seems like a bad, bad move.