[kodablah]

You'll never be as fast as compiled, unless you're thinking this engine would JIT at which point your "no need for C compilers" became "carry around a WASM compiler". The more rational approach might be to transpile into the target lang, but there are two primary reasons for C extensions, performance and/or FFI, and neither is accomplished via the transpile route. If it's the third, less oft-cited reason for C extensions, avoiding rewrite and/or reuse existing C code, then yes it has value.