Thing is, not every C++ project is full of template metaprogramming, and at least on the corporate world it is quite common to use binary libraries, which NuGET, conan, vcpkg, and OS package managers support.

Also at least in VC++, modules are already a thing, no need to keep parsing template code all the time.

Doing a C++23 import std (which imports the whole standard library) takes a fraction of the time of #include <iostream> in VC++.

So a clean build out from repo means compiling only our own code, not the whole world as in Rust.

Still looking forward to binary libraries support in cargo (well one can dream).