I think that the choice of Meta-Wiki for fosting cross-wiki personal CSS and javascript is not a good choice. All wikis are already linked to Commons that scales far better for all users, rather than Meta-Wiki which is still small and not made for hosting these personal contents for millions users
In addition there are far lot more admns and people helping on Commons than on Meta-Wiki, and there are also some good translations in this multilingual site.
(but maybe developers think that the exploding growth of Commons causes some long term risks for users as Commons has now difficulties to find backuping mirrors due to its volume)
Now we can expect many more users visiting Meta-Wiki and helping to develop its content (notably pages about policies, chapters, groups; strategic development; grants...)