[pjmlp]

Since Apple and Google have focused on their own languages, clang steam went out, as no one else seems that interested in improving ISO C++ support, rather the LLVM foundations, which require C++17 as basis.

If the likes of Intel, AMD, ARM, IBM, Embarcadero,.... don't step up in ISO C++ support at upstream, clang will stay mostly C++17 with some bits and pieces from C++20.

It is already ironic, that after so many years of being joked for their non-standard extensions, VC++ has the best ISO C++20 support.