Yes, indeed. All points are valid. Opaque anyref (externref) or reference-types WebAssembly proposal not yet in all browsers, but after it interop will become

Yes, indeed. All points are valid. Opaque anyref (externref) or reference-types WebAssembly proposal not yet in all browsers, but after it interop will become much easier. At least you don't need glue code for JS side any more.