> Text editor (vim/emacs/sublime/Atom, etc.): For the Go newbie is too complex
Text editor may be hard(?) to setup for a go newbie, although I do not personally agree with this statement, but at least local shell + text editor + command line compiler is a well known and understood stack. A newbie having a problem with it can always ask for help - coworkers, friends, online, etc., and solution is always within her control.
Replacing this stack with a web-based one will change a set of known problems into a set of unknown problems, outside of anybody's control, except for the b3log and their team. And their software is fresh and untested, and surely contains a lot of bugs, as any new code.
I'm not sure that sounds like a good value proposition - not to me.