FWIW, I disagree about Carbon following the Dart plan (Carbon lead here).
Carbon is following a plan much more analogous to Kotlin -- we even say that on our site very explicitly.
The "subset" of C++ APIs you emphasize is only about there existing some long-tail esoteric parts of C++ that may be used rarely enough to not worry about. Everything that people use we'll need to support here. We think about interop constantly and are designing it into every aspect of the language.
Carbon is following a plan much more analogous to Kotlin -- we even say that on our site very explicitly.
The "subset" of C++ APIs you emphasize is only about there existing some long-tail esoteric parts of C++ that may be used rarely enough to not worry about. Everything that people use we'll need to support here. We think about interop constantly and are designing it into every aspect of the language.