I agree. I'm especially annoyed by HN's terrible design because this is supposed to be a site for web enthusiasts. Stubbornly sticking to this unusable, ugly, un-responsive design, just for the sake of looking hack-y and unrefined, is ridiculous. A designer could fix this mess in a few hours (and many actually have, with third-party HN clients).
For general browsing, I use Clearly[1]. Because HN has comments and threads and whatnot, I use a dedicated app[2].
1. https://chrome.google.com/webstore/detail/clearly/iooicodkii...
And although I don't have this problem, some users have visual impairments. Having a site that is so difficult-to-read is discriminating against those people. It's 2015, and it's long-past time to worry about accessibility.
Agree with you on accessibility and responsiveness. Think visual design for the most part should stay the same.