:Hi Spinningspark. Sorry, didn't know about WP:BRD yet, I don't edit that much here on the English WP. 
 :Interwiki links on many dab pages are a huge mess, indeed. But Dab pages are basically just lists of things referred to by the same word/term. So why link to pages on other projects that are lists of things referred to by a different word/term? Moon (disambiguation) for example is basically a list of things (places, people, works) called "moon". Why should we link it to lists of things called "Mond" or "Kuu" on other projects? Readers don't need to go to other projects for that, we already have a list of things called "Mond" here at Mond for example.  
 : Help:Interlanguage links#Purpose says "used primarily to link an existing English Wikipedia page to a corresponding page in another language Wikipedia." Corresponding page in this case IMHO means a page that covers the same subject. So our list of things called "Eureka" should link to other lists of things called "Eureka". There's pure interwiki chaos on many dab pages, because many words have several different possible translations in many other languages and dab pages could (and often do) exist for each of those translations. That's why dab pages should only link to other dab pages of the same name. 
 :But I admit that Eureka/Heureka might be a bit of a borderline case, as the difference is only one letter and the page also includes things called "Heureka", so in this case the interwiki chaos is not quite as bad as on some other dab pages.