I have always found this to be HN's "Badge of Irony": Funds some of the best, highest velocity startups in tech; Can't get their shit together around UX/Mobile.
I wonder why I've not seen this expressed before, I've thought it every time I see these complaints regarding the HN mobile experience.
Maybe it isn't desirable to have people writing comments on their phone. The comment quality is likely greatly reduced by people writing pithy one-liners on their phones.
The best content on this site are the long expert comments, and those will never be typed on a mobile device.
All that being said, maybe its by design that the UX isn't great on mobile devices... or you know maybe the people that could make the changes just have bigger fish to fry.
Sam, there are already mobile apps for this. But the constantly expiring links due to limitations to Arc should be fixed.