You're right that being able to point your browser right at the app is very convenient. With Go, you can have a command line flag that switches between http.Serve (for development) and fcgi.Serve (for production).
I’m not sure, I don’t dismiss fcgi outright here, I find the arguments for it compelling (not a huge fan of http for many reasons) but it has to be really worth it to break the consistency of using http everywhere.