Agreed. Go is a systems language not really designed or good for mobile development.

I think the only advantage anyone could claim is for concurrency, but that actually very easy in standard Android Java using built-in classes like Handler, Looper, and AsyncTask. Even if it wasn't there are lots of solutions that involve annotations or event buses that makes things even easier than Go, like: https://github.com/greenrobot/EventBus/blob/master/HOWTO.md