It's not about the idea of writing a pure native app, but about making it easier to build a hybrid app without an exploding build process complexity.
Emscripten is again a perfect example of how it should be done: FFI calls into Javascript are trivial (it's even possible to embed JS code into C/C++ source files), and I can build a complete hybrid WASM/JS app without having to bring in a completely different build system that's completely alien to the C/C++ world.
It even works without any build system at all since the emcc compiler/linker wrapper is also the Javascript bundler, yet the entire emcc wrapper acts like a GCC/Clang compatible compiler/linker with some extra Emscripten specific flags. The Emscripten SDK didn't jump into existance like this, the difference to the NDK team is that the Emscripten team actually listens to their users.
