> most C code still is correct C++ code Syntaxicaly yes, but with a more precise semantic and clearer stated "undefined behavior". The canonical example is the work around type punning and such.

> And there is no real performance reason. Many static typed languages compile to code as fast as C - if not faster thanks to tighter semantics.

Speed is only one part of the equation. For stuff like drivers and low level embedded development, we still needs C like unsafe memory manipulation. Rust,D,C# etc all have ways to do that.

> Many static typed languages compile to code as fast as C - if not faster thanks to tighter semantics. (Other than that some C compilers are better quality because of the effort went into them due to language popularity rather than any language feature)

Let's just agree to disagree on that one