User blog comment:Rappy 4187/Technical Update: September 7, 2015/@comment-126761-20150908142420/@comment-24473195-20150908150627

"I disagree with disallowing userspace imports; there are situations where you trust a user to edit the site's JavaScript, but don't want to make them admin."

It is easy enough to copy the javascript to one's own userspace and run it from there, or possibly copy it to the mediawiki namespace. So there doesn't really seem to be a good reason to allow those imports.

"If it's the latter, will they be able to actually edit the JS before it's approved, because I don't know whether I agree with users who've had nothing to do with our community suddenly gaining the ability to edit our JavaScript, no matter how trusted they are by Wikia."

VSTF, Helpers and possibly other groups have always had the ability to edit a Community's Javascript. They simply don't do it often because they don't generally need to.

Anyway, from their description, it seems that they are reviewers not editors. So they won't fix anyone's code, that's up to the community. At least that's what is written in the Help page.