That's actually true about Hacker News on mobile screens. Yes, you can zoom in, but then you have to scroll left and right to see the text. Extremely annoying.
Yep, the Hacker News default font size is tiny, period. And I find the 'pro-zoomer croud' pretty odd to be honest. It's more work, and it's tedious. You wouldn't pan around a book.
Personally I use the Hacker Web (web-app) on iOS [1] and Georgify Chrome extension [2] on desktop and couldn't be happier.
