This is not a replacement for Common Lisp. It is in the same niche as Guile (but quite faster).

Yeah, I see Janet as "what Guile intended itself to be", though it is quite a bit smaller (in some ways that's a postive). I find the choices it made to be more pragmatic and it's far more accessible in non-linux environments since Guile tied itself closely to guix.

Current Guile it's much faster.