> ... and the project’s readme literally tells you not to do that.

Could you quote which paragraph you're talking about?

AFAIK, interoperability with C++ code is just one of their explicit goals; they only place that as the last item in the "Language Goals" section.

> Existing modern languages already provide an excellent developer experience: Go, Swift, Kotlin, Rust, and many more. Developers that can use one of these existing languages should.