I am not a developer but I don't think you want to use HTML5 test for a way to determine if a browser is good. You get points on that test for things no one gives a crap about. For example Chrome gets two bonus points for Ogg Vorbis support and WebM with Vorbis support.
Sure it is only two points but they have nothing to do with whether the browser renders anything correctly and there are lots of other things on that test that give points that you may never use. As someone else has said I think the issue is webkit, not HTML5.
Maybe that audio support isn't important to you but assuming you're in the USA maybe in another country that's how a low key artist records music....better to have it and not need it, then need it and not have it