Definitely not as easy but Go managed to get it to work fairly well with some extra overhead. I would rather the language design for pure Java first and C interop second.
This approach results in more closed ecosystems, though, where everything has to be re-implemented to work well, instead of reusing existing libraries (that have been polished for decades in some cases).
Also, what about OS APIs? Those always going to be at the bottom of the stack, and they are increasingly async themselves.
