Thread:Forum:Tech Wishlist And Bug Reports/Links to Wikipedia always shown as blue/reply (2)

I'm not sure to what extent MediaWiki is capable of detecting interwiki links. From mediawikiwiki:Help:Interwiki linking: "Unlike internal links, interwiki links do not use page existence detection, so an interwiki link will appear blue even if the page does not exist on the remote wiki." And in the general case, I don't see how it can scale, given how interwiki links are allowed to sites not running MediaWiki software (such as wiki:DontRepeatYourself on Programming Tropes).