User blog comment:Sannse/Five Things Every Admin Should Know - Revisited/@comment-4999100-20171107032438/@comment-27345308-20171108110629

Allowing every admin on every wiki to edit JavaScript of their wiki means somebody will be able to turn your account into a cross-wiki vandalbot just by linking you to their wiki or make other administrators of a wiki demote themselves without knowing what's happening and many, many worse things. It is a miracle editing JavaScript was not as strict before.