In that case they should really just deprecate MSVC and point C and C++ devs to Clang. Would make life a lot easier for library authors.

Clang is included on Visual Studio installer for ages.

It was the official answer back when they decided only to do C++ and leave C behind, until the change of heart with C11/C17 support.

Also note Apple and Google aren't any longer the nice sponsors of clang, hence it has also lost steam as other contributors aren't at the same level as they used to be.