I believe at least most of those lisp dialects are useful without any frameworks. You get view template with s-expr for free instead of erb/ejs/eex. And you are basically composing everything like plug in elixir very easily. However, the down side of not having a major framework is community does not have same context to discuss and share, which keeps almost every lisp dialect remains out of mainstream.

Most of the time not, but the comparison of a specific feature of phoenix and go as a programming language is not valid.