This, like nearly every Slashdot headline, is sensationalistic. If you read what Dave said it is clear that he is referencing support for *older* versions of WebKit;
"Even when they have been fixed in the latest Chrome or Safari, older WebKit implementations like PhantomJS and UIWebView still don't have the fix."
Think about it for a moment. IE has had 3 major releases in the past 10 years (I'm not counting IE10 just yet). Safari, on the other hand, has had 6. Chrome has had, what ... 24 now? So, yeah ... if you take a normalization library like jQuery and look at the amount of code needed to support the various iterations of browsers, you don't need to be a rocket surgeon to realize that supporting the various bugs in 30 versions will take more code/effort than 3 versions. The latest versions of WebKit, as the title seems to suggest, is not "as broken" as older versions of IE.