You realize HN comment pages scale pretty well, right? And everyone's happy.
There's no reason a site like DDG shouldn't make better use of larger windows. If someone wants to read long lines across a full-screen window on a 30" display (and I don't), they should be able to. In my case, I'd just like sites to make reasonably good use of a 1280-wide window (half a 30"), which DDG doesn't. That's not unreasonable.
Anyway, here's another good example of a page that scales well: