Well I did say it's 'not there yet' and it is 'being implemented' so of course it is not yet usable as of now. Your same point could be said about Dart C/C++ FFI, Rust async-await, etc.

The parent comment I replied to said: "...I cannot find any documentation at all relating to C++ interop." and this some kind of "documentation" that is related to 'C++ interop'.