This is why languages such as D and Nim are interesting. They support both styles of development. You can always use the RAD style to get to something people like, optimize the fast paths, and still use RAD style on experimental features.
The prebuilt libraries are the main advantage Ruby and Python have. A converter for them to new languages would negate that, though.
The prebuilt libraries are the main advantage Ruby and Python have. A converter for them to new languages would negate that, though.