In the new versions of node, node-inspector is built in and can be fired using the command node --inspect index.js. However, this always provides a command line
Starting the Chrome (or other "desktop" application) is platform dependent. Core Node can't do it and it would add unnecessary complexity (e.g. think about discovering the install location, dealing with Chrome not installed, etc).
This would tie Node to Chrome, which is not desirable.
Chrome does not provide a way to pass devtools URL from the command line.