I use Firefox for HN (and all my other web content consumption) on both mobile and desktop. In that way I still get the benefit of all my synced browser features (e.g. add-ons) and avoid the edge cases where a page isn't textual and resorts to the browser anyway. The weakness of the experience - and where apps/add-ons have a niche - is reply notifications, comment tracking, etc. I would be more interested in a web-app type HN wrapper than anything native. That's not to disparage any native app designers, though! I appreciate that many people prefer that experience.