Non-legacy Reddit link: https://reddit.com/r/RedditEng/comments/1bdtrjq/wrangling_20...
If everyone loved it, there'd be no Hacker News mobile apps.
The only things I would change is make the Reply link open a text box in-line rather than needing a new tab, and add an icon next to my username/karma in the top right whenever there's a new reply to one of my comments.
Any other "modernization" is probably a step BACKWARDS in UX. I really like the simple design of HN.
If it were your site, suited to the current year, I wouldn't come back here.
They could've improved the styling so things were nicely formatted and easy to read, but they went above and beyond (in a bad way).