When I speak to experienced Rails developers (and most of the ones I speak to are consultants, so heavy bias there), the argument is that they are able to very

When I speak to experienced Rails developers (and most of the ones I speak to are consultants, so heavy bias there), the argument is that they are able to very quickly spin up an application and be productive. JS's toolset and quirks do not allow this. Note: I'm not one of these devs and have only really used Ruby, not Rails, so I cannot confirm or deny this.