To the contrary, these features should have been in C++ for decades, whereas standardizing networking at any point in time is a mistake because APIs and best practices for high performance networking constantly evolve ; if any kind of networking had been standardized in C++ 15 years ago, then today the only thing we could say is "don't use it" just like you mustn't use the standard network APIs of other languages if you remotely care about writing good software, just like you mustn't use std::regex or other things that were mistakenly standardized in C++.

With C++26 we're barely getting to where python was already in 2001 with the introduction of decorators or Java in 2004 with annotations. C# had these features from the very beginning (albeit at runtime, not compile-time like C++).