Exrm looks good for updating an already established application. Doesn't look like it does anything for the initial setup and configuration of a new system though.

For me, the ultimate test is can I copy my application to a flash drive, walk it to a new clean system, and "paste" it to that new system. Go really does let me do that.

> But i didn't find any mature libraries like Phoenix.

Yup. But then I tend not to need larger frameworks with my Go apps. Like you allude to, Go apps tend to be less monolithic.