> Hacker News
The links are too close together on a small phone screen and I cannot tap them accurately half the time. This might mean the difference between upvoting/downvoting something, or flagging something instead of clicking on the context option, when I don't mean to.
HN is pretty great when it comes to desktop, though - simple design, no dark patterns, except for maybe the comments with lower score becoming unreadable, which is bad from an accessibility point of view and an odd design choice otherwise.
> old Reddit
Again - by far the best site when compared with the new version, which has bad performance on both desktop Firefox and mobile Firefox; in addition to lots of dark patterns, sometimes refusing you the ability to view a page if you don't sign in, in addition to nagging you to download their app.
It's still bad, though - too zoomed out, can't read anything without zooming in a lot with a phone and when you do, you need to scroll horizontally, which makes reading paragraphs of text a pain. Curiously, they do/did have a version that actually looked okay on phones (i.reddit.com, or something like that), but it doesn't seem to open anymore and redirects to the main site instead.
I think that once you go below ~400px of screen width, designing a decent UI becomes difficult regardless of what you do. It's so much easier to mess around with the meta viewport tag and offer a slightly zoomed out version, but even then you still have the challenge of making something usable across multiple platforms, input methods and so on.