Last modified: 2012-04-20 12:41:27 UTC
$wgUseSiteJs was added by r6223. The idea was to avoid an extra web server HIT.
One usage removed with r107777. There is only one left in OutputPage to add the 'site' resource loader link.
I think we could drop that global just like we dropped $wgUseSiteCss.
In the ResourceLoader world I don't think it actually adds a hit either, necessarily...
Indeed. Last I checked ResourceLoader doesn't output links for user/site js/css if the related pages on-wiki are empty or inexistent.
Marking wontfix per Krinkle comment #2