I really like HN and the simplicity of everything (from create/login workflow to submit links). Everything is fast, straight to the point, and clean/simple HTML.
I've just a really minor complaint: on wide screen, reading comments is really painful (for me at least, I maximise all my windows...). It's not the size of the font, it's really the width of lines on wide screen. I've the impression that we're a lot of developers on HN, with huge screens, and the wide screens experience could be better in "vanilla" HN.
I sometimes open a link in HackerWeb (for instance https://hackerweb.app/#/item/36238342) just to have a better reading experience...
Every thing else: don't change, it's perfect!
table.hnmain { max-width: 900px; }